msm: camera: isp: Update write master registers always

Update write master registers always without conditional
checks. Currently if flush is done on request 1 then subsequent
request does not have complete write master register configurations
causing the green frames. Flush can come on any request, if flush
request has some changes with request write master configuration
then subsequent request does not apply these changes.

Change-Id: I6b4c7adb988ce2f04e987732d69bdcbd615712b3
Signed-off-by: Ravikishore Pampana <rpampana@codeaurora.org>