ASoC: Add AV timer changes for MSM targets

Add snapshot of avtimer changes for MSM targets. The code
is migrated from msm-3.18 kernel.

Change-Id: I7f07c6678171dfa83d5080333d57ffaf4e1d3829
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>