perf tool: Move pmus list variable to a new file

The 'pmus' list variable is defined as static variable under pmu.c file.

Introduce a new pmus.c file and migrate this variable to it. Also make
it non static so that it can be accessed from outside.
Suggested-by: Ian Rogers <irogers@google.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Acked-by: Ian Rogers <irogers@google.com>
Acked-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ananth Narayan <ananth.narayan@amd.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Santosh Shukla <santosh.shukla@amd.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: carsten.haitzler@arm.com
Link: https://lore.kernel.org/r/20221206043237.12159-2-ravi.bangoria@amd.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/Build

@@ -73,6 +73,7 @@ perf-y += trace-event-parse.o
 perf-y += parse-events-flex.o
 perf-y += parse-events-bison.o
 perf-y += pmu.o
+perf-y += pmus.o
 perf-y += pmu-flex.o
 perf-y += pmu-bison.o
 perf-y += pmu-hybrid.o

tools/perf/util/pmu.c

@@ -22,6 +22,7 @@
 #include "debug.h"
 #include "evsel.h"
 #include "pmu.h"
+#include "pmus.h"
 #include "parse-events.h"
 #include "print-events.h"
 #include "header.h"
@@ -58,7 +59,6 @@ struct perf_pmu_format {
 int perf_pmu_parse(struct list_head *list, char *name);
 extern FILE *perf_pmu_in;
 
-static LIST_HEAD(pmus);
 static bool hybrid_scanned;
 
 /*

tools/perf/util/pmus.c

+// SPDX-License-Identifier: GPL-2.0
+#include <linux/list.h>
+#include <pmus.h>
+
+LIST_HEAD(pmus);

tools/perf/util/pmus.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PMUS_H
+#define __PMUS_H
+
+extern struct list_head pmus;
+
+#define perf_pmus__for_each_pmu(pmu) list_for_each_entry(pmu, &pmus, list)
+
+#endif /* __PMUS_H */