NOUPSTREAM: ANDROID: mm: Memory Management Exports

per_cpu_ptr_to_phys symbols is needed for vendor loadable modules
to find the per cpu physical address of symbols.

[CPNOTE: 01/07/21] Lee: Vendor GKI export

Squash:

  NOUPSTREAM: ANDROID: mm/memory.c: export mm_trace_rss_stat
  NOUPSTREAM: ANDROID: mm/memblock: export memblock_end_of_DRAM
  NOUPSTREAM: ANDROID: GKI: export cma symbols for cma heap as a module

Bug: 176125613
Bug: 171499373
Bug: 140294230
Change-Id: Ifc23a8a9cae8eb11c94107eb9b9237a838f830bc
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Lee Jones <joneslee@google.com>