msm: display: release kickoff before fence waiting

After configuration is done, save the acquired fences,
release the kickoff and ov_lock, then wait for the cached
fences. This way the next prepare will not be blocked by
waiting for acquired fences.

Change-Id: Id6f5b30e0d20cd59bd0aebf71af7cb47ecb1cf5b
Signed-off-by: Ken Zhang <kenz@codeaurora.org>