hwtracing: hisi_ptt: Keep to advertise PERF_PMU_CAP_EXCLUSIVE

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7F2F2


CVE: NA

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Keep to advertise PERF_PMU_CAP_EXCLUSIVE. Such pmus can only have one
event scheduled at a time, and the perf tool will report device busy.

Signed-off-by: Junhao He <hejunhao3@huawei.com>