!216 AMD： Add CONFIG_PERF_EVENTS_AMD_BRS=y to openeuler_defconfig

Merge Pull Request from: @haochengxie 
 
This patch set AMD Perf BRS feature built in x86 kernel as default.

Need this PR merged first：
https://gitee.com/openeuler/kernel/pulls/201 
 
Link:https://gitee.com/openeuler/kernel/pulls/216

 
Reviewed-by: Liu Chao <liuchao173@huawei.com>
Reviewed-by: Kai Liu <kai.liu@suse.com>
Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>