!949 mm: page_counter: remove unneeded atomic ops for low/min

Merge Pull Request from: @ci-robot 
 
PR sync from:  Peng Zhang <zhangpeng362@huawei.com>
 https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/thread/KYRABPTSB6EKOTCKUIGSLAPKEFA5O5FS/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/949

 

Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>