MFC r306262, r306267, r310021: (needed to avoid conflicts on later merges)

Remove bus_dma_get_range and bus_dma_get_range_nb on armv6. We only need
this on a few earlier arm SoCs.

Restrict where we need to define fdt_fixup_table to just PowerPC and
Marvell.

Add the missing void to function signatures in much of the arm code.

MFC r307067, r307068, r307087, r307088, r307089,
r307091, r307092, r307093, r307095, r307098,
r307115:

r307067:
Make intc driver compatible with upstream DTS

- Fix compatibility strings
- Properly decode upstream's two-cell interrupt specs. Our home-made dts
does not have two-cell interrupts so no need to preserve backward
compatibility

r307068:
Make Rapsberry Pi watchdog driver compatible with upstream DTS

- Fix compatibility strings
- Compensate the difference in base address for our custom DTS and
upstream one (for backward compatibility)

r307087:
Make sure intc is attached before interrupt consumers

If pass order is not specified devices are attached in the order they are
defined in dts. Some interrupt consumers may be defined before intc. Also
make sure intc interrupt-parent local_intc is attached before intc itself.

r307088:
Add compatible strings used in upstream dts files

r307089:
Make framebuffer driver compatible with upstream DT

- Add compatibility string
- Add simplebus as possible parent bus

r307091:
Add compatibility string from upstream DT

r307092:
Make BCM2835 GPIO driver compatible with upstream DT

- Add compatibility string
- Make reserverd and read-only properties optional

r307093:
Make BCM283x USB driver compatible with upstream DT

- Make resource allocation logic depend on compatibility string
to check what format of DTS node should be used - FreeBSD's or upstream

r307095:
Make VCHI driver compatible with upstream DT

- Add compatibility string
- Compensate difference in base address between our custom DTB and upstream one

r307098:
Make BCM28x USB driver compatible with upstream device tree

This should have been committed in r307093: resource allocation depends
on source of the device tree. upstream dts has extra interrupt that we can
ignore

r307115:
Fix typo in comment

Spotted by: loos

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Rename ARM_INTRNG and MIPS_INTRNG to INTRNG. This will help with machine
independent code that needs to know about INTRNG such as PCI drivers.

Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation

Define local-intc for BCM2836 platform (RPI2) and make BCM2835 intc
a child of it. This is done in conformity with Linux dts files and
as preparation for rework of BCM2836 interrupt controller for INTRNG.

Reviewed by: gonzo
Differential Revision: https://reviews.freebsd.org/D5807

Stop defining fdt_pic_table when building for ARM_INTRNG.

Stop using machine/fdt.h in the arm kernel code when we don't need it.

opt_global.h is included automatically in the build. No need to
explicitly include it in these places.

Sponsored by: Netflix

Move all the files named foo/common.c to foo/foo_common.c, as
appropriate for each of the 'foo' in the tree. This will allow us to
compile them together (although symbol conflicts prevent us from doing
that today, this just fixes the file name collision).

Add barebone Raspberry Pi port. Supported parts:
- Interrupts controller
- Watchdog
- System timer
- Framebuffer (hardcoded resolution/bpp)