ASoC: wcd93xx: Remove deadlock for ANC use-cases

When calling snd_soc_dapm_sync(), it eventually tries to
lock the same mutex already locked for ANC widgets and a
deadlock occurs. By moving the mutex unlock to just before
snd_soc_dapm_sync(), this deadlock is prevented.
This problem was introduced in Linux 3.5.

Reference commit: 2894770e
for sound/soc/codecs/tlv320aic3x.c

Change-Id: Ic52d94d0097e79c085fcca2770274d48042b53b6
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>