!757 openEuler supports bcache by default on x86 platforms

Merge Pull Request from: @Tom_zc 
 
To fix issue about https://gitee.com/openeuler/kernel/issues/I6N4EP?from=project-issue
and test report is in here: https://gitee.com/Tom_zc/my_doc/blob/master/kernel%E7%A4%BE%E5%8C%BA/%E9%AA%8C%E8%AF%81openEuler%E7%BC%96%E8%AF%91%E6%94%AF%E6%8C%81bcache.md 
 
Link:https://gitee.com/openeuler/kernel/pulls/757

 

Reviewed-by: Liu Chao <liuchao173@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>