sound fixes for 4.11

Since we got a bonus week, let me try to screw a few pending fixes.

A slightly large fix is the locking fix in ASoC STI driver, but it's
pretty board-specific, and the risk is fairly low.

All the rest are small / trivial fixes, mostly marked as stable, for
ALSA sequencer core, ASoC topology, ASoC Intel bytcr and Firewire
drivers.
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