MFC r283291: don't use CALLOUT_MPSAFE with callout_init()

The main purpose of this MFC is to reduce conflicts for other merges.
Parts of the original change have already "trickled down" via individual MFCs.

MFC r299503,r299504:

r299503 (by cem):

snd_hda(4): Don't pass bogus sizeof()s to unused sysctl arg2 parameter

None of the sysctl handlers in hdaa use the arg2 parameter, so just pass zero
instead. Additionally, the sizes being passed in were suspect (size of the
pointer rather than the value).

CIDs: 1007694, 1009679

r299504 (by cem):

snd_hda(4): Don't pass bogus sizeof()s to unused sysctl arg2 parameter (again)

More of the same sort of issue as r299503, just missed some sysctls added in a
different place than the others.

CIDs: 1007692, 1009677, 1009678

MFC r283064:
Fix an off-by-one error by adding proper range checks when parsing the
HDA association descriptors. This fixes a crash during device probe
for some HDA PCI devices.

MFC r263710, r273377, r273378, r273423 and r273455:

- De-vnet hash sizes and hash masks.
- Fix multiple issues related to arguments passed to SYSCTL macros.

Sponsored by: Mellanox Technologies

MFC: r264832

- Sprinkle const and static as appropriate.
- Convert the remainder of snd_hda(4) to take advantage of nitems().
- Use DEVMETHOD_END.
- Use NULL instead of 0 for pointers.

MFC r283064:
Fix an off-by-one error by adding proper range checks when parsing the
HDA association descriptors. This fixes a crash during device probe
for some HDA PCI devices.

MFC r263710, r273377, r273378, r273423 and r273455:

- De-vnet hash sizes and hash masks.
- Fix multiple issues related to arguments passed to SYSCTL macros.

Sponsored by: Mellanox Technologies

MFC: r264832

- Sprinkle const and static as appropriate.
- Convert the remainder of snd_hda(4) to take advantage of nitems().
- Use DEVMETHOD_END.
- Use NULL instead of 0 for pointers.