msm: mdss: release rotator fence on kickoff failure

When rotator fails, the rotator fences will never be signaled through
rotator completion. For this case still need to release the sync fences
as the source buffers will no longer be used for this session.

Change-Id: Idfb2a4b042e89f28d19b10db8e77e06bebad8459
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>