ASoC: msm: qdsp6v2: Add timestamp in voip frame header

Uplink timestamp needs to propagate to userspace for AV sync.
timestamp field is added in voip frame header to
capture the timestamp from LPASS for each uplink packet.

Change-Id: Id701df56e5a3d36bf83771ba9731c61a03dae3ba
Signed-off-by: Helen Zeng <xiaoyunz@codeaurora.org>
Signed-off-by: flar2 <asegaert@gmail.com>