drm/msm: update sde rsc backoff time and mode-2 sequence

Update sde rsc backoff time and mode-2 sequence based
on hardware programming recommendation. This patch also
adds the eventlog support in rsc driver.

Change-Id: I6c06855330b7e07095e31d746d2f3288b27fbd1a
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>