!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> 

arch/x86/configs/openeuler_defconfig

@@ -398,6 +398,7 @@ CONFIG_PERF_EVENTS_INTEL_UNCORE=m
 CONFIG_PERF_EVENTS_INTEL_RAPL=m
 CONFIG_PERF_EVENTS_INTEL_CSTATE=m
 CONFIG_PERF_EVENTS_AMD_POWER=m
+CONFIG_PERF_EVENTS_AMD_BRS=y
 # end of Performance monitoring
 
 CONFIG_X86_16BIT=y