soc: msm: add size check to fix out of bounds on ANC

Before calling audio ANC ioctl functions, compare the
allocated buffer size to the size of the header and ANC cmd header
to ensure the buffer is big enough.

Change-Id: I8fcd0a830853d802bbb11fc243a4d392fbe384f3
Signed-off-by: Timothy Sham <tsham@codeaurora.org>