disp: msm: sde: update wr_ptr_success state post wait

Update the wr_ptr_success state to avoid waiting for
two frames pp_done_tx_irq. It ensures frame done callback
is triggered, if IRQ's are disabled for long time by
some external entity.

Change-Id: I9ee72bd65dd7251bf8db0b6843fad02b675935bc
Signed-off-by: Jayaprakash <jmadiset@codeaurora.org>