gralloc: Allow legacy devices to use PMEM for ADSP (camera).

Partially bring back PMEM support for legacy devices having proprietary camera
libraries stuck in PMEM. This change allows these devices to continue using
PMEM for the camera, and ION for everything else.

Change-Id: I1afbc7d137b3d49b2ab3e53917b16fd920ea140b
fix compile error
use /dev/graphics/fb0 instead of /dev/msm_rotator
Add msm8660 as a valid target

Change-Id: Ic19c24428ef5d9ca911e3d8f82b001d61a9377b8
msm7x27a: enable NO_IOMMU