fix fd leak in memtrack.msm8960

Close smaps_fd when exiting function.

Bug: 11007903
Change-Id: I4a9fcd1e84aae195d229e5dd11f99ccb9f6f5006
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