ASoC: msm: release mutex before calling snd_soc_dapm_sync

When calling snd_soc_dapm_sync(), it eventually tries to
lock the same mutex already locked in the machine driver
and deadlock might occur because of this. By moving the
mutex unlock to just before snd_soc_dapm_sync(), this
possible deadlock is prevented.
This problem was introduced in Linux 3.5.

Reference commit: 2894770e
for sound/soc/codecs/tlv320aic3x.c
[ASoC: tlv320aic3x: Remove deadlock from snd_soc_dapm_put_volsw_aic3x()]

Change-Id: I6291d4dc4d9848fbf3cf5d89c42530343b138255
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>