perf cpu_map: Rename struct cpu_map to struct perf_cpu_map

Rename struct cpu_map to struct perf_cpu_map, so it could be part of
libperf.

Committer notes:

Added fixes for arm64, provided by Jiri.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-3-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/tests/perf-time-to-tsc.c

@@ -50,7 +50,7 @@ int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe
 		.sample_time	     = true,
 	};
 	struct thread_map *threads = NULL;
-	struct cpu_map *cpus = NULL;
+	struct perf_cpu_map *cpus = NULL;
 	struct perf_evlist *evlist = NULL;
 	struct perf_evsel *evsel = NULL;
 	int err = -1, ret, i;