ASoC: msm: qdsp6v2: Return error for invalid ioctl's

pcm lib of alsa framework doesn't expect any userspace structures being
passed for a ioctl command.If compress driver recieves a ioctl not
supported by it return error instead of calling pcm library.

CRs-fixed: 664419
Change-Id: I2f46e087f95ce7edeac1a9b82f76ed2fb6f2d195
Signed-off-by: Gopikrishnaiah Anand <agopik@codeaurora.org>