drm/msm/sde: rsc sequence change and MMCx separation.

This change updates the modified sequencer memory configuration based on
platform and takes care of enabling the sperate MMCX rail for the supported
platform.

Change-Id: I5c71c75378dd85bcefb394164d36ab99c658a40a
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>