Backport of r338074 - generalize uart_bus_probe and add SNPS support to x86

Submitted by: Rajesh Kumar
Differential Revision: https://reviews.freebsd.org/D17381

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

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:

Copy over the support files (except sys/conf and sys/mips/conf) for
RMI XLR processor support. This port has been contributed by RMI and
brought up to date by Randal Stewart (rrs@). This port is a work in
progress, and there might still be significant changes. The port
makes it to multi-user, but is still early beta.

ok we now get so that the uart init's and we can print. We
cannot set baud rate as they did in 6.4, this hoses things and
we loose our 38400 default term.

We now lock somewhere in tcinit.

White space changes

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M rmi/xls_ehci.c
M rmi/clock.h
M rmi/xlr_pci.c
M rmi/perfmon.h
M rmi/uart_bus_xlr_iodi.c
M rmi/perfmon_percpu.c
M rmi/iodi.c
M rmi/pcibus.c
M rmi/perfmon_kern.c
M rmi/perfmon_xlrconfig.h
M rmi/pcibus.h
M rmi/tick.c
M rmi/xlr_boot1_console.c
M rmi/debug.h
M rmi/uart_cpu_mips_xlr.c
M rmi/xlrconfig.h
M rmi/interrupt.h
M rmi/xlr_i2c.c
M rmi/shared_structs.h
M rmi/msgring.c
M rmi/iomap.h
M rmi/ehcireg.h
M rmi/msgring.h
M rmi/shared_structs_func.h
M rmi/on_chip.c
M rmi/pic.h
M rmi/xlr_machdep.c
M rmi/ehcivar.h
M rmi/board.c
M rmi/clock.c
M rmi/shared_structs_offsets.h
M rmi/perfmon_utils.h
M rmi/board.h
M rmi/msgring_xls.c
M rmi/intr_machdep.c

More initial RMI files. Note that these so far do NOT
compile and many of them may disappear. For example
the xlr_boot1_console.c is old code that is ifdef'd out.
I will clean these sorts of things up as I make progress
on the port. So far the only thing I have I think straightened
out is the bits around the interupt handling... and hey that
may be broke ;-)