add config about writing mounted devices in openeuler_defconfig

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8S3GW


CVE: NA

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

OpenEuler need detect conflict of opening block device, so
enable it as default.

Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>