disp: msm: sde: fix handling the missing pp-done interrupt cases

With posted-start, ctl scheduler status and pending-kickoff
count are checked to address the missing pp-done interrupt
cases, which can occur if the IRQs are disabled for a long
time by some entity. Currently this check is done after
the wr-ptr-irq. At this point the scheduler status may
or may not be idle, based on the frame-transfer. Move this
handling after the timeout, so the scheduler is guaranteed
to be in idle state for working use-case.

Change-Id: I3fa9ecce8139ff667c1882e286571169c543c797
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>