msm: mdp: Revert MDP Port split changes

Revert MDP changes to avoid bus overflow
seen in camera usecases.

Change-Id: I1c687750bd22c8f64ab28a500562cbfbcb6a6048
Signed-off-by: Kiran Kumar H N <hurlisal@codeaurora.org>
Signed-off-by: Praveen Ac <praveenac@codeaurora.org>