mm/vmstat: move pgdemote_* out of CONFIG_NUMA_BALANCING

mainline inclusion
from mainline-v6.8-rc1
commit b805ab3c6935d14654ccc28f16ffce7a13c2c528
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8YBMI

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b805ab3c6935d14654ccc28f16ffce7a13c2c528

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

Demotion can work well without CONFIG_NUMA_BALANCING.  But the commit
23e9f0138963 ("mm/vmstat: move pgdemote_* to per-node stats") wrongly hid
it behind CONFIG_NUMA_BALANCING.

Fix it by moving them out of CONFIG_NUMA_BALANCING.

Link: https://lkml.kernel.org/r/20231229022651.3229174-1-lizhijian@fujitsu.com


Fixes: 23e9f0138963 ("mm/vmstat: move pgdemote_* to per-node stats")
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>