!286 defconfig: add helper script for update openeuler_defconfig

Merge Pull Request from: @SuperSix173 
 
The config in openeuler_defconfig is inconsistent with the config in openEuler,
which may cause misunderstanding. For example, CONFIG_SET_FS is set to y in
arch/aarch64/configs/openeuler_defconfig of the OLK and openEuler22.03-LTS
branches. However, CONFIG_SET_FS cannot be opened in aarch64.

Add helper scripts and update openeuler_defconfig. After adding, deleting,
or modifying config in Kconfig, developers can run 'make update_oedefconfig'
to update openeuler_defconfig and submit it in pr.

No config changed for release kernel package.

https://gitee.com/openeuler/kernel/issues/I63KVP 
 
Link:https://gitee.com/openeuler/kernel/pulls/286

 
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: Jason Zeng <jason.zeng@intel.com>
Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>