When HDMI is plugged in mute speakers not master.

On kernel 3.2, master also mute SPDIF, causing the HDMI to be silent.
Mute Speakers instead.

BUG=chromium-os:28564
TEST=Manual, gmerge chrontel to ZGB and hotplug a TV several times
making sure audio routes to the TV, and that volume and mute controls
continue to function.
(cherry picked from commit 74011d196c0079e372f6751320dbad406b574c37)

Change-Id: Ia3ef1fcbdb5d881939283034b21033f8b7933ffd
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/19991
Reviewed-by: Todd Broch <tbroch@chromium.org>
Reviewed-by: Olof Johansson <olofj@chromium.org>
1 file changed