ASoC: msm: qdsp6v2: Hardware accelerated effects helper routines

Audio post processing features such as HeadphoneX are supported
only in DSP. To apply post processing for the playback which is
not routed through DSP, effects are applied through hardware
accelerated mode where PCM samples are sent to DSP for effects
processing in write path and captured by userspace through read
path. Enhance the audio effects and q6asm api to support the
hardware accelerated audio post processing.

Change-Id: I11e94d998a155ada4095085ebc3a54088ceb4db6
Signed-off-by: Subhash Chandra Bose Naripeddy <snariped@codeaurora.org>