drm/msm/sde: signal retire fence at ctl start timeout

When ctl start irq is not received retire fence is not signaled
and this is leading to device freeze. By signaling the retire fence
at ctl start timeout will allow for next commit and avoid
device freeze.

Change-Id: I968807d5f2a5a8e30369559f0a269b0f625dbbdc
Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>