overlay: Allocate from MM heap as a fallback

 * Not all devices support IOMMU yet, so use the MM heap as a fallback.

Change-Id: I9d9f3dffb92f5b4bf45422df0f66a40611943202
hwcomposer: Use RGB_BORDERFILL only on MDP 4.2 and higher.

MDP 4.0 does not support RGB_BORDERFILL and causes the display to fail
initializing.

Patch Set 2: Actually set MDP_RGB format if not BORDERFILL.

Change-Id: Ib2007221c4dc78fd17ced97c0a0d28896c877b80
gralloc : Don't fallback to system heap for framebuffer allocations

MDP can not handle buffers from system heap, so try camera heap
first, before falling back completely to system heap

Change-Id: I7e2ab0094be5d1075be1ca93295cf54b84101835
display: Cover NO_IOMMU for msm7x30 too

Change-Id: Ic68672f386a06fd0ac9fd1f18eec3188415a8642