Initial msm8x64 memory tracker HAL

Reads memory info from kgsl to track unaccounted for GL and ION
memory.  Right now it has to parse every allocation and then
cross-reference it against /proc/pid/smaps.  It would be faster
to modify the kgsl driver to keep counters that could just be
read directly.

Bug: 10294768
Change-Id: Icb17558f03ce53bc594fbee097e51fe82e15dc31
Fix remainig exynos references

Also fix a compile warning by replacing enum with int in the getMemory
function.

Change-Id: Ic4bbba425486bb7f456e928968afa5f2b04ca7ea
fix fd leak in memtrack.msm8960

Close smaps_fd when exiting function.

Bug: 11007903
Change-Id: I4a9fcd1e84aae195d229e5dd11f99ccb9f6f5006