!782 openEuler supports bcache by default on x86 platforms

Merge Pull Request from: @Tom_zc 
 
Fix issue https://gitee.com/openeuler/kernel/issues/I6N4EP,
And solve the kabi change caused by enabling bcache in x86 platforms.
Related PR: 
        https://gitee.com/openeuler/kernel/pulls/757
        https://gitee.com/openeuler/kernel/pulls/771 
 
Link:https://gitee.com/openeuler/kernel/pulls/782

 

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