[ALSA] hda: 92HD73 DMIC Amps

Changed hardware gain mixers for the digital mic's from HDA_OUTPUT to
HDA_INPUT.

Signed-off-by: Matthew Ranostay <mranostay@embeddedalley.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>