misc: pmem_wrapper: Rename ion_heap to ion_heap_id.

Change-Id: Iaf89b719d19494bf5780208ee35c80b81db6d9bc
u8800: Add & Enable PMEM->ION wrapper.

Remove references to PMEM DMA (cma).

Change-Id: I1ee8aeb28f4f729e0be93cb4bfc94615b7b7f9af