sound fixes for 4.14-rc6

We've got slightly more fixes than wished, but heading to a good
shape.  Most of changes are about HD-audio fixes, one for a buggy code
that went into 4.13, and another for avoiding a crash due to buggy
BIOS.

Apart from HD-audio, a sequencer core change that is only for UP
config (which must be pretty rare nowadays), and a USB-audio quirk as
usual.
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