ASoC: msm: qdsp6v2: Userspace interaction cleanup

Listen ioctl function transfers data to/from userspace
and additionally implements logic to process ioctl command.
Ioctl function should delegate the processing to internal
functions for supporting compat mode.
This change moves the processing into internal function.

Change-Id: Iffb86d2aa85579340eecd48f396c5fa839f521d5
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>