mdss: Support continuous splash for 8974 V2

The interface offsets for MDSS MDP have changed from V1 and V2.
Adding check to determine the correct offset address.

Change-Id: I395b8f8ffa26b2cfb652b9688f982c0dfe7965b2
Signed-off-by: Siddhartha Agrawal <agrawals@codeaurora.org>
1 file changed