disp: msm: sde: cancel delayed idle_notify_work beginning of every commit

In some cases HAL sets CRTC_PROP_IDLE_TIMEOUT property to zero
and idle_notify_work which is already scheduled will send notfication
on timer expire. This will cause janks in subsequent commit. This
change cancels the existing delayed idle_notify work and will get
rescheduled after frame trigger if CRTC_PROP_IDLE_TIMEOUT property is
non zero.

Change-Id: I8b9ebce8282425f55838b94cfd345b5e733fa645
Signed-off-by: Mahadevan <quic_mahap@quicinc.com>