hwc: mdp3 don't support rotator

Change-Id: I26fe237831eb6fa41968d5eb6a75938e6dc53183
hwc: only setHPD when external display connected

Change-Id: I8b6e6e6d9264111bf9bab098e3634ad0d2bab900
display: Cover NO_IOMMU for msm7x30 too

Change-Id: Ic68672f386a06fd0ac9fd1f18eec3188415a8642
display: no IOMMU for msm7x27a as well

Change-Id: I4dd331dd9dddf4b767dcb455796b8435ddfa9f46
TEMP change

Change-Id: I3fe9a49bc8c68910842f8645d666ee45651bbf22