Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

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

The AR71xx has APB interrupts in the MISC registers from 0-7, later
chips have more.

So for now, let's allow more. We should teach the apb code to just
reject interrupts that lie outside what the chip can do at runtime.

Set the svn:eol-style = native and svn:mime-type = text/plain
properties on all files in this tree.

Submitted by: rpaulo@

Place proper svn:keywords tag on all these files. They were created
somehow without them on projects/mips, and that mistake was propigated
over to head.

Submitted by: rpaulo@

Merge from projects/mips to head by hand:

Merge support files for the Atheros AR71xx (and soon AR9xxx)
processors, except files from sys/conf and sys/mips/conf. This work
was done primarily by Olecksandr Tymoshenko and works on the
RouterStation and RouterStation PRO. Other AR71xx-based boards have
been reported as working as well (RouterBoard, for example).

- Add intr counters for APB interrupts

- Handle memory requests on apb level, do not pass them up to
nexus
- Unmask IRQ in bus_intr_setup
- Do not count timer IRQ (IRQ0) as stray

- Revert changes accidentally killed by merge operation

- Add some debug output
- Do not manage memory, it's not neccessary. Just pass
request up to nexus to map it to KSEG1

- Add apb device. apb is bridge that connects UART, GPIO,
I2S and PCM to main bus
- Connect apb and uart_bus to build