disp: msm: sde: modify dsc blocks reservation check in RM

Add changes to reserve dsc blocks by routing even numbered
dsc encoders to even pingpong blks and odd numbered dsc encoders
to odd numbered pingpong blks.

Change-Id: I9242b3f7a2784194f9e4a7d30eff6ae3ec16b196
Signed-off-by: Jayaprakash <jmadiset@codeaurora.org>