disp: msm: sde: update fence offset during cwb usecase in cmd mode

Add changes to avoid clone_mode encoder for detection of panel mode.
This allows cmd mode display to signal the release_fence right after
pp-done/wb-done interrupt and unblocks any input buffers waiting
on release_fence.

Change-Id: Id87e54f29c960e301d42d49d4763220e6e4cc6f5
Signed-off-by: Jayaprakash Madisetty <jmadiset@codeaurora.org>