Revert "mm-video: Add the ability to use PMEM while using TARGET_USES_ION := true"

This reverts commit 16ff8a6a2e3559bed6117239e645498a8d0d3692.
mm-video: port heap mask change to ion.
mm-video: include msm_ion.h instead of ion.h
mm-video: Add the ability to use PMEM for encoding while using ION.