drm/msm/sde: do not send stop splash signal from eDRM to LK

When eDRM commits the frame it tells LK to stop the splash
and waits for around 4 seconds to get the acknowledgment from LK.
Since LK would keep on running when RVC is also active
so eDRM on each commit will poll for 4 seconds.
In order to resolve the problem, eDRM should not tell LK to stop splash
and neither wait for the acknowledgment from LK.

Change-Id: I0bae0946445fa26898f85eaece943ff4ab93cfbd
Signed-off-by: Rahul Sharma <rahsha@codeaurora.org>