platform: msm_shared: Update MDP5 for msm8956 support

msm8956 supports MDSS 1.11 version and has Interface-2 in addition
when compared to msm8952. This change updates MDP5 with the new
MDSS_MDP version checks at relevant places for MDP5 configuration for
8956, adds support for split pingpong for msm8956.

Change-Id: I823a1744cde84924aa7d578832899c067c389b60
3 files changed