Revert "BoardConfig: Removed kernel rotator cflag (can't find any reference to it in source)"

This reverts commit ad2f4582b95d96ce9c82cba04f61968f0378761a.
msm8660.mk: switch to composition type mdp (again)

still seems to give best results with video playback

Change-Id: I47ea01cc3b4a47d0827324969d96e19b9827ee28