fbdev: msm: Set the commit_in_progress flag after sync_fence_wait

The commit_in_progress flag is set only after waiting for the fences
in the current composition cycle. This will ensure that the
release fence of the previous composition is signalled, even though
there is a fence timeout in the current composition cycle.

Change-Id: I06653c922f195bb5936530ddeaa5a9fcb291fb3f
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>