mm-camera2:isp2: Avoid multiple frame requests

While handling request frames with internal remap
during register update ioctl miss, we need to avoid
frame requests for both the vfe's.

Change-Id: Ia92be21184f208ece61c16a701552b2a2defe03a
Signed-off-by: Meera Gande <mgande@codeaurora.org>