ASoC: msm-lsm-client: cleanup ioctl functions

Fix the issue where copy_from_user interface is not used properly.
Cleanup the ioctl function so that there is no illegal memory access.

Change-Id: Iffe2bbc0d33f365a852bb0974ee5c45ab724214b
Signed-off-by: Revathi Uddaraju <revathiu@codeaurora.org>