dtc: Sync with upstream commit 26a0fe5

- 0206c0f ("Handle top-level /delete-node/ directives.")
- d612a9e ("Remove C++11 standard constrain")
- Remove extra white lines after the $FreeBSD$ tag removal

Reviewed by: kevans (earlier), theraven, emaste
Differential Revision: https://reviews.freebsd.org/D41482

Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

Pull in latest fixes from dtc, up to 0060471

This includes a small battery of /memreserve/ fixes to make sure dtc is
properly writing these regions into the output file and reading them back
out.

As of this update, dtc will now also assume common defaults for -I/-O if
only one is specified; namely, dts for one implies dtb for the other and
vice versa (Requested by: jhibbits, preserves GPL dtc behavior too).

MFC after: 1 week

Fix build issue with clang 8.0.1

The algorithm header is needed to use std::remove_if

dtc(1): Update to 1a79f5f26631

Highlights:
- Bugfix for order in which /delete-node/ and /delete-property/ are
processed [0]
- /omit-if-no-ref/ support has been added (used only by U-Boot at this
point, in theory)
- GPL dtc compat version bumped to 1.4.7
- Various small fixes and compatibility improvements

Reported by: strejda [0]
MFC after: 1 week

dtc(1): Update to upstream 006664a

Highlights:

- Passing "-" to -o will now cause output to go to stdout
- Path-based syntactic sugar for overlays is now accepted. This looks like:

/dts-v1/;
/plugin/;

&{/soc} {
sid: eeprom@1c14000 {
compatible = "allwinner,sun8i-h3-sid";
reg = <0x1c14000 0x400>;
status = "okay";
};
};

MFC after: 3 days

dtc(1): Update to upstream ea3c233

Highlights of this update:
- /__local_fixups__ is now generated to be GPL dtc and libfdt compliant
- Compiling with -@ will now cause dtc to assign phandles to all labelled
nodes
- /include/ and /incbin/ now handle absolute paths correctly
- The manpage now has information about overlays, including how to apply
them and how to generate them
- Syntactic sugar for overlays is now supported, allowing an overlay DTS
like:

=
/dts-v1/;
/plugin/;

&foo {
foo,status = "okay";
};
=

to generate a fragment targetting <&foo>.

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

dtc: update to upstream 227d6a3

- Report missing includes at the correct location.
- Add initial support for the -@ option emitting a symbol table.
- Add support for running tests with and without -@
- Add support for generating __fixups__ and __local_fixups__
- Attach the to-string transform to the node path.

Improvements to BSD-licensed DTC.

- Numerous crash and bug fixes
- Improved warning and error messages
- Permit multiple labels on nodes and properties
- Fix node@address references
- Add support for /delete-node/
- Consume whitespace after a node
- Read the next token before the second /memreserve/
- Fix parsing of whitespace
- Clean up /delete-node/ and add support for /delete-property/
- Handle /delete-node/ specifying a unit address

Obtained from: https://github.com/davidchisnall/dtc @df5ede4

Improvements to BSD-licensed DTC.

- Added an expression parser so that expressions from headers are now working
- Fixed missing null terminators on cross references
- Disabled exceptions / RTTI in the build for smaller binaries
- Changed phandle order generation to be identical to GPL'd dtc

Lots of improvements to the BSD-licensed dtc

- Various fixes to includes (including recursive includes)
- Lots of testing that the output exactly matches GPL'd dtc
- Lots of bug fixes to merging
- Fix incorrect mmap usage
- Ad-hoc memory management replaced with C++11 unique_ptr and similar

Patrick Wildt has successfully run many (all?) of the GPL dtc test suite.

Add support for parameterised device tree sources to the device tree compiler.

Reviewed by: brooks
Sponsored by: DARPA, AFRL

Import new (BSDL) device tree compiler. Now built by default, so that it can't
be used on the host system (and not installed on the device, if required). The
GPL'd one is still available if there are any devices that need it (make
universe passes with it, including kernels that use fdt, but there may be some
out-of-tree ones). WITH_GPL_DTC can be used to select the old one, for now.

Probably won't be MFC'd, but we'll remove the GPL'd version in head after the
new one has had a lot more testing and ship it in 10.0.