disp: msm: sde: signal retire fence in wr_ptr timeout

There can be few cases of ESD where CTL_START is cleared but
wr_ptr interrupt does not come. Signaling retire fence in these
cases to avoid freeze and dangling pending_retire_fence_cnt.

Change-Id: I167f69dce5cbe43b4771e5056d8a73bd7587e76e
Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>