mm: vmstat: add cma statistics

mainline inclusion
from mainline-5.13-rc1
commit bbb26920
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I3ZQ5G
CVE: NA

-------------------------------------------------

Since CMA is used more widely, it's worth to have CMA allocation
statistics into vmstat.  With it, we could know how agressively system
uses cma allocation and how often it fails.

Link: https://lkml.kernel.org/r/20210302183346.3707237-1-minchan@kernel.org


Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: John Dias <joaodias@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit bbb26920)
Signed-off-by: Yue Zou <zouyue3@huawei.com>
Reviewed-by: chenwandun <chenwandun@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>