ALSA: hda/sigmatel - Disable automute for Elo VuPoint

[ Upstream commit d153135e ]

The Elo VuPoint 15MX has two headphone jacks of which neither work by
default. Disabling automute allows ALSA to work normally with the
speakers & left headphone jack.

Future pin configuration changes may be required in the future to get
the right headphone jack working in tandem.

Signed-off-by: Michael Pobega <mpobega@neverware.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Change-Id: I14ee3b832ad309efffefd3a3f246ff3c7ac86cab