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

MFC r316541, r316544, and r320688 from HEAD to stable/11.

r316541:
Fix a double free in ixgbe_rxeof()

r316544:
Don't overwrite vf->flags variable at the end of ixgbe(4) ixgbe_add_vf()

r320688:
ixgbe(4): Update HEAD (p3) to 3.2.12-k

Includes:

- Support for X550EM devices.
- Support for Bypass adapters.
- Flow Director code moved to separate files
- SR-IOV code moved to separate files
- Netmap code moved to separate files

Sponsored by: Intel Corporation

MFC r303032
Fixup DA cable detection routines to not set the cable type to
unknown if they do not match one of two cable types.

PR: 150249
Approved by: re (gjb)