dsp: q6voice: Adds checks for an integer overflow

there is no check for cvs_voc_pkt[2],when receives
0xffffffff from ADSP which results in an integer overflow
Fix is to address this.

Signed-off-by: Shaik Jabida <quic_sjabida@quicinc.com>
(cherry picked from commit 4524418cd14dce47e4ea7234618f919e28dbbe5a)
Change-Id: I2edaef7a22bf0e8d517b3269d004992a3ca35d4f