disp: msm: increase delay times while waiting to turn off rscc clocks

RSC is timing out while checking for power control register,
increasing wait times only after a poms, removes this issue.

Change-Id: I4a324eb3c87e7dfb84d9a8b0a11597327d206a74
Signed-off-by: Nilaan Gunabalachandran <ngunabal@codeaurora.org>