audio/msm7630: Add latency support for LPA

-Audio loss for few seconds on headset connection.
-Stream is unmute in checkDeviceMuteStrategies before device switch
occurs.
-Increase delay in tempMute to ensure unmuting happens after device
switch happens. Also change latency for LPA to correct value similar
to that of hpcm.

Change-Id: I539a4726f6b9d53bbfdc5f92a8801d5f14c360eb
CRs-Fixed: 448355