msm-camera: Update bit shift for VFE write masters

Make changes for correct bit shift required for VFE write masters
and update burst length.

Change-Id: I9fccfeee33d24674344ebce5190e6d429b985303
Signed-off-by: Chandan Gera <cgera@codeaurora.org>
Signed-off-by: Mohit Setia <msetia@codeaurora.org>