sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Fix test-dts{,o} targets

There were two main problems here:

1.) sys/dts/Makefile.inc is not included from various */overlays directories
by default, only ../Makefile.inc
2.) When shelling out for DTS/DTSO, cwd != .CURDIR, so enumeration always
failed

These changes allow make test-dts and make test-dtso to function in their
respective directories.

Reviewed by: manu
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D17961

Add dtb overlays support

DTB Overlays are useful to change/add nodes to a dtb without the need to
modify it.
Add support for building dtbo during buildkernel.
The goal of DTBO present in the FreeBSD source tree is to fill a gap in
time when we submit changes upstream (Linux). Instead of waiting 2 to 4 months
we can add a DTBO in tree in the meantime.
This is not for adding DTBO for capes/hat/addon boards, those will be
better to put in a ports.
This is also not for enabling a i2c/spi/pwm controller on certain pins,
each user have a different use case for those (which pins to use etc ...)
and we cannot have all possible configuration.

Add a dtbo for sun8i-h3-sid which add the SID node missing in upstream dts.

Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D14782

Fix SYSDIR path. After the move, we need to chop off a couple ../ from
the prior definition. But a safer definition is SRCTOP/sys, so use
that.

Sponsored by: Netflix

Move sys/boot/fdt/dts to sys/dts and adjust scripts.

Sponsored by: Netflix