vidc: Modify shift value for extended PAR width.

Currently extended pixel aspect ratio register shift
value for width is 15. Due to this the actual width
value returned by core is getting doubled while
sending to user space. Now correct values are returned
by modifying the shift value to 16.

CRs-fixed: 362985
Change-Id: I996bfc79b327492a791017fd5b33638f82240d76
Signed-off-by: Rajeshwar Kurapaty <rkurapat@codeaurora.org>