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

Use the correct le*dec function to decode a 16bit type.

PR: 194228
Submitted by: David Horwitt
MFC after: 2 weeks

ONFI parameters are little-endian, hence we must take care to convert them
to native endianness. We must also pay attention to unaligned accesses.

Copy the interesting parameters to a new struct so the rest of the code can
forget about these problems.

Submitted by: Kristof Provost <kristof@sigsegv.be> (cleanup) and me (orig).

Search for and validate the ONFI params as specified in the standard.

The ONFI spec states that at least two bytes of the signature ("ONFI")
must be present, and the CRC must be correct to have a valid parameter
page. If the page is not valid there are at least two backup pages where
the data can also be found.

Submitted by: Kristof Provost <kristof@sigsegv.be> (cleanup) and me (orig).

o Add ONFI signature check.
o Add Micron chip found in Freescale Vybrid Family
Phytec COSMIC board.

Approved by: cognet (mentor)

Import work done under project/nand (@235533) into head.

The NAND Flash environment consists of several distinct components:
- NAND framework (drivers harness for NAND controllers and NAND chips)
- NAND simulator (NANDsim)
- NAND file system (NAND FS)
- Companion tools and utilities
- Documentation (manual pages)

This work is still experimental. Please use with caution.

Obtained from: Semihalf
Supported by: FreeBSD Foundation, Juniper Networks