msm: vidc: avoid access to unwanted register

While processing the response from video hardware, video
driver is accessing a register which does not exist. It
is even not needed for functionality purpose. Removing
the access for the same.

Change-Id: Ib4fec718d2f057860878bf8928b96fb46be47b13
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>