misc: pmem: Add support for CMA.

Add new allocator type PMEM_ALLOCATORTYPE_DMA.
This is based on the PMEM system heap + ION CMA heap.

To use CMA (platform data changes):
 * Select allocator type PMEM_ALLOCATORTYPE_DMA.
 * Supply private_data with CMA device.

Change-Id: I3ca87e862117b064f34c0ebe79d356ab72088122
Revert "u8800: Add & Enable FMEM."

FMEM is yesterday's news. We're going CMA!

This reverts commit 13b27b7b7ab034c0fbc9610cf9acc6d72b30b6e2.

Change-Id: Icc405b9d331e016ff12f1c7a3edc93d64a8933ac
u8800: Use tabs instead of spaces.

Also, set PMEM id to 0 since there's only one PMEM heap.

Change-Id: Ic82f23056db600cef9928eeb0ec8df4e4e6a1327
u8800: Use CMA with PMEM heap.

Change-Id: I12c052fc4426da7b30eb702ba87196f230fd6298