sound fixes for 5.3-rc7

A collection of small fixes as usual:

- More coverage of USB-audio descriptor sanity checks
- A fix for mute LED regression on Conexant HD-audio codecs
- A few device-specific fixes and quirks for USB-audio and HD-audio
- A fix for (die-hard remaining) possible race in sequencer core
- FireWire oxfw regression fix that was introduced in 5.3-rc1
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