sound fixes for 5.0-rc5

Only three fixes: a fix for Realtek HD-audio looks lengthy, but it's
just a code shuffling, and the actual changes are fairly small.  The
rest are a PCM core fix for a long-standing bug that was recently
scratched by syzkaller, and a trivial USB-audio quirk for DSD
support.
-----BEGIN PGP SIGNATURE-----
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=KZ/d
-----END PGP SIGNATURE-----