Camera: Support obtaining camera memory from MemoryHeapIon

* Exynos 5 devices want the ION file descriptor from MemoryHeapIon

Change-Id: I9e445cf24c15713f713181667e7b7caa1a96592e
Merge pull request #13 from CyanogenMod/cm-11.0

Camera: Support obtaining camera memory from MemoryHeapIon