add CONFIG_PERF_EVENTS_AMD_BRS=y to openeuler_defconfig

amd inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5ZIMJ


CVE: NA

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Enable AMD perf branch sample feauture in x86 openeuler defconfig.
It's implemented as a bool type option, must set 'y' to enable it.

Signed-off-by: Xie Haocheng <haocheng.xie@amd.com>