sound fixes for 3.18-rc4

This update contains mostly only fixes for Realtek HD-audio codec
driver in addition to a long-standing sysfs warning bug fix for
USB-audio.  One significant fix for Realtek codecs is the update of
EAPD init codes.  This avoids invalid COEF setups for some codec
models and may fix "lost sound" in some cases.  The rest are a bit
high volume but only new quirks and ALC668-specific COEF tables.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
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=0z7g
-----END PGP SIGNATURE-----