ALSA: hda - fix inverted internal mic on Acer AOA150/ZG5

This patch enables internal mic input on the machine.

Cc: stable@vger.kernel.org
BugLink: https://bugs.launchpad.net/bugs/1107477


Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>