CMA debugfs provides how many CMA pages were allocated. It's useful to
detect CMA memory leak.
E.g) --- /sys/kernel/debug/cma/cma-faceauth_tp
Bug: 276901078
Test: dumpstate_board.txt on adb bugreport includes the info
Change-Id: Ic050c78ff6455a2960be239732ab6214c3789106
Signed-off-by: Minchan Kim <minchan@google.com>