drm/msm/sde: handle irq disable case for pp timeout

It may possible that some kernel driver "X" disables the interrupt
for long duration (more than 100ms). The kernel won't receives the
jiffie or any other interrupt during this time frame. Once driver "X"
reenable the interrupt all the drivers start receiving the interrupt
and process them. Timers are also updated at this time and sde driver
might start process the pp_timeout if it was waiting for previous
frame done. Such race condition can be avoided by detecting this error
condition and wait for few more jifies.

Change-Id: I47d467f71d3bec982a65e4d522b66bd2e63bb752
Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>