sys: Remove $FreeBSD$: two-line .h pattern

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

Fix ofw pcib when it rman_init fails

rman_fini assumes rman_init has been called successfully. Clean up
init faulure by only calling rman_fini when rman_init has succeeded.

While here add ofw_pcib_fini that can be used by a sub-class to clean
up.

Reviewed by: bz, imp
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D35681

Rename ofwpci.c to ofw_pcib.c

It's a class0 driver that implements some pcib methods and creates
a pci bus as its children.
The "ofw_pci" name will be used by a new driver that will be a subclass
of the pci bus.
No functional changes intended.

Submitted by: Kornel Duleba <mindal@semihalf.com>
Reviewed by: andrew
Obtained from: Semihalf
Sponsored by: Alstom Group
Differential Revision: https://reviews.freebsd.org/D30226

OFWPCI: Add support for NEW_PCIB.

MFC after: 3 weeks

OFWPCI: Improve resource handling.
- add new rman for prefetchable memory. Is used only if given 'ranges'
property contains prefetchable memory range.

- not all ranges in 'ranges' property are subject for rman's filling.
Tegra for example, have two addition records which are used for
'pci 'register' -> 'assigned-address' -> 'ranges' machinery.
Add sc_ranges_mask for masking not rman related ranges.

- consistently pass unknown (not managed at this level) resources
allocation/release/adjust requests to parent.

MFC after: 3 weeks

Reduce OFW PCI code duplication - involves ARM, PPC and SPARC64

Import portions of the PowerPC OF PCI implementation into new file
"ofwpci.c", common for other platforms. The files ofw_pci.c and ofw_pci.h
from sys/powerpc/ofw no longer exist. All required declarations are moved
to sys/dev/ofw/ofwpci.h. This creates a new ofw_pci_write_ivar() function
and modifies some others methods. Most functions contain existing ppc
implementations in the majority unchanged. Now there is no need to have
multiple identical copies of methods for various architectures.

Requested by: jhibbits
Reviewed by: jhibbits, marius
Submitted by: Marcin Mazurek <mma@semihalf.com>
Obtained from: Semihalf
Sponsored by: Annapurna Labs
Differential Revision: https://reviews.freebsd.org/D4879