ANDROID: GKI: fix ABI diffs caused by GPU heap and pool vmstat additions

New nr_gpu_heap fields in vmstat file cause ABI differences.
Fix them by adding the fields and we don't print it to vmstat now
as it's out-of-tree.

Bug: 128254966
Bug: 130198686

Test: boot and check /proc/vmstat has nr_gpu_heap
Change-Id: Idb322f80dbfde785720f01b3ad9954eb4feb7326
Signed-off-by: Minchan Kim <minchan@google.com>
Signed-off-by: Kyle Lin <kylelin@google.com>
Signed-off-by: Martin Liu <liumartin@google.com>