arm64: perf: add the missing case 20 in PMEVN_SWITCH()

hulk inclusion
category: bugfix
bugzilla: 23209
CVE: NA

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Add the missing case 20 in PMEVN_SWITCH().

Fixes: 2f10f935b6a6 ("arm64: perf: avoid PMXEV* indirection")
Signed-off-by: NWei Li <liwei391@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

arch/arm64/kernel/perf_event.c

@@ -528,6 +528,7 @@ static inline bool armv8pmu_event_is_chained(struct perf_event *event)
 		PMEVN_CASE(17, case_macro);			\
 		PMEVN_CASE(18, case_macro);			\
 		PMEVN_CASE(19, case_macro);			\
+		PMEVN_CASE(20, case_macro);			\
 		PMEVN_CASE(21, case_macro);			\
 		PMEVN_CASE(22, case_macro);			\
 		PMEVN_CASE(23, case_macro);			\