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

Introduce a new TLB invalidation function for efficiently invalidating
address ranges, and use this function in pmap_remove().

Tested by: jchandra

Move TLB definitions to tlb.h

Remove unused stuff from cpu.h.
Move inappropriate stuff in cpu.h elsewhere:
{s,g}et_intr_mask -> md_var.h
num_tlbentries -> tlb.h
Remove #define clockframe trapframe and fix clock, which was the only place
this was used.
All the rest of this stuff was unused.

# we're not quite minimal yet, since we duplicate a few status register things
# here...

Inspired by: bde@

Merge jmallett@'s n64 work into HEAD - changeset 4

Re-write tlb operations in C with a simpler API.
Update callers to use the new API.

Changes from http://svn.freebsd.org/base/user/jmallett/octeon

Approved by: rrs(mentor), jmallett