drm/msm/sde: stage border fill after ctl start timeout

In some error cases ctl start irq is delayed more than ctl start
timeout period and it is received after programming the
next commit CTL registers but before next flush. Due to this
only new CTL register configuration takes effect but not the pipe
configuration. This is leading to smmu fault. Staging border-fill
in these cases after ctl start timeout will help prevent illegal
iova 0x0 (non-configured pipe) transactions onto the bus.

Change-Id: I85418df3a922a8468f31adc285fac217e8f2eee4
Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>