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

[siba] make the debug code somewhat useful again.

It's still not configurable by a kernel option; that'll come next.

Sponsored by: Palm Springs

[siba] add more MCS tx power offset decoding.

This is required by the bwn(4) N-PHY support.

Obtained from: Linux ssb (definitions)

[siba] add TX power index entry parsing.

This is required by the bwn(4) N-PHY support.

Obtained from: Linux ssb (definitions)

[siba] add extra methods for chipcommon access and PLL configuration.

This is needed by the PHY-N bwn(4) support.

Obtained from: Linux b43 (definitions)

[siba] add r4 and r8 sprom formats for core_pwr_info.

The upcoming bwn(4) N-PHY support requires this (among other things that
are (hopefully) upcoming.)

Obtained from: Linux ssb (definitions)

[siba] add 2GHz/5GHz FEM parameter fetching and accessor methods.

This is used by the bwn(4) PHY-N code that I'm working on.

o uses bus accessor macros to read values from ivar so no more values
are referenced directly from ivar pointer. It's to do like what other
buses do. [1]
o changes exported prototypes. It doesn't use struct siba_* structures
anymore that instead of it it uses only device_t.
o removes duplicate code and debug messages.
o style(9)

Pointed out by: imp [1]

supports SPROM rev8 informations properly which are used to support
low-power PHY of bwn(4) and LDO voltage adjustments.

Adds siba_bwn module which is used with bwn(4). Main purpose of this
module is to distinguish parts of Silicon Backplane and of Broadcom
Wireless.

Support for the siba bus found in many broadcom products.

Submitted by: bms@
Obtained from: p4 mips branch