ASoC: msm: Enable initial/trailing silence removal

For gapless audio playback, the DSP HW decoder needs to
remove the initial and trailing samples from the decoder
output according to meta data present in the stream. This
change is to enable the silence removal by sending the
meta data down to DSP.

Change-Id: I206b3e06f7b5012accf21a0256aa45cac92cbbf0
Signed-off-by: Ravi Kumar Alamanda <ralama@codeaurora.org>