ALSA: HDA: Fix single internal mic on ALC275 (Sony Vaio VPCSB1C5E)

ALSA: HDA: Fix single internal mic on ALC275 (Sony Vaio VPCSB1C5E)

BugLink: http://bugs.launchpad.net/bugs/761134

commit 262ac22d21ee2bf3e1655b2e5e45cc94b356e62f upstream.

In cases where there is only one internal mic connected to ADC 0x11,
alc275_setup_dual_adc won't handle the case, so we need to add the
ADC node to the array of candidates.

BugLink: http://bugs.launchpad.net/bugs/752792
Reported-by: Vincenzo Pii
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>