mdss: mdp: fix rotator compat layer copy

The compat list for rotator is incorrectly using
compat pointer. This change adds correct support
for copying compat pointer list to rotator structure.

Change-Id: I2207a7f6089676713dfb55d20e31873164c4c85b
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>