Cherry-pick commit e7fdd52779a6 for 4.1+ stable

[Takashi Iwai <tiwai@xxxxxxx>]

Hi Greg,

could you cherry-pick the upstream commit

e7fdd52779a6c2b49d457f452296a77c8cffef6a
    ALSA: hda - Implement loopback control switch for Realtek and other codecs

for 4.1 and later stable kernels?  It turned out that the recent
stable commit for Gigabyte mobo causes a regression on other models
with the same PCI SSID, and this commit gives an alternative fix.

This should be applicable to 4.1+ kernels cleanly.


thanks,

Takashi
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