mm/cdm: enable CONFIG_COHERENT_DEVICE in openeuler_defconfig

ascend inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4JMLR


CVE: NA
-------------------

enable CONFIG_COHERENT_DEVICE in openeuler_defconfig

Signed-off-by: Lijun Fang <fanglijun3@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>