!9340 serial: max3100: Lock port->lock when calling uart_handle_cts_change()

Merge Pull Request from: @ci-robot 
 
PR sync from: Yi Yang <yiyang13@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/T5OYZTTPRT2WHRQNKSH5QBIBK3WVJGRM/ 
 
https://gitee.com/src-openeuler/kernel/issues/IA7D3L 
 
Link:https://gitee.com/openeuler/kernel/pulls/9340

 

Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>