msm: camera: Changes to handle change in sensor data rate

Changes to handle change in data rate, during change in
sensor mode, to reconfigure snps to the new data rate.

This fixes QVGA issue of camera failure on the first time
switch to QVGA.

Change-Id: I5a52c27aa00fa7497bca85b196dd71a296e8c6ac
Signed-off-by: Samyukta Mogily <smogily@codeaurora.org>