msm8960-common: use qcom display variant

Change-Id: I595b696da8166e27b193e43da3831e66389a3cbf
msm8960-common: update header files for qcom display variant

Change-Id: Icc59bb3fdb7701667f5ea4530eb1a01c2d1ab3d3
msm8960-common: update property for mdp composition

Change-Id: I546c3b243e739b866162ada824740f3c084c6d0c