ASoC: q6lsm: Add check for integer overflow

During sound model registration, the total memory size needed by the
sound model data is the sum of sound model length, number of zero
padding bytes and the calibration size. It is possible this sum
can result into integer overflow causing difficult to debug issues.
Add check for integer overflow to avoid such possible issues.

CRs-fixed: 792367
Change-Id: I9f451aa308214a4eac42b82e2abf1375c858ff30
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>