ASoC: msm: Add support to enable audio post processing in DSP

Add interface to support configuring equlaizer, bass boost,
virtualizer and reverb effects in DSP for tunnel mode of
playback.

Change-Id: I5ed578df1e1cb860734d2205c0895e82cfbdfbfc
Signed-off-by: Subhash Chandra Bose Naripeddy <snariped@codeaurora.org>
Signed-off-by: Ravi Kumar Alamanda <ralama@codeaurora.org>
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: I8f9d5d64fee5874ef1eb2aba2ae38730cfe3e9bb
Signed-off-by: Ravi Kumar Alamanda <ralama@codeaurora.org>
ASoC: msm: Disable gapless offload playback by default

Add a flag to platform private data to enable/disable gapless
playback. The platform data is updated by mixer control.
If gapless playback is disabled ignore next track and handle
partial drain as full drain. The stream is opened in gapless
mode based on the paltform data.

Change-Id: I36cea976bcb53f50069653aec4f0f8cc869f491a
Signed-off-by: Krishnankutty Kolathappilly <kkolat@codeaurora.org>
ASoC: msm: Do not allow commands during gapless transition.

During gapless playback if flush is sent to the driver before EOS
acknowledgement from DSP, the playback is switched to stream one.
On EOS ack the stream one is closed resulting in no audio. The fix
is to not allow pause/resume/flush commands during transition from
one clip to other during gapless playback. Playback should move to
the second stream if the playback enters transition period.

Change-Id: I1be30956cce677e153ef5b8a362de303fec7620a
Signed-off-by: Panwar Vivek <vpanwa@codeaurora.org>