ASoC: msm: Initialize the timeout of DAPM powerdown as zero for voice call

The default timeout of DAPM power down for RX path is 5000, which
is used to prevent click and pop for playback. But it's too long
for voice call and causes the back to back call and device switch
to not work.
Change this value to 0 to reduce the shutdown delay for voice call.

Change-Id: I705a2cb1efa4432b32d1f3e9d98f47ae124966cc
Signed-off-by: Helen Zeng <xiaoyunz@codeaurora.org>