sound fixes for 4.5-rc7

It's our tradition to get a high volume of fixes late at rc7: this
time, X32 ABI breakage was found and this resulted in a high number
LOCs.  The necessary changes to ALSA core codes were fairly
straightforward, and more importantly, they are specific to X32, thus
should be safe to apply.

Other than that, rather a collection of small fixes:
- Removal of the code that blocks too long at closing the OSS
  sequencer client (which was spotted by syzkaller, unsurprisingly)
- Fixes races at HD-audio HDMI i915 audio binding
- a few HDSP/HDPM zero-division fixes
- Quirks for HD-audio and USB-audio as usual
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