perf env: Remove needless cpumap.h header

Only a 'struct perf_cmp_map' forward allocation is necessary, fix the
places that need the header but were getting it indirectly, by luck,
from env.h.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-3sj3n534zghxhk7ygzeaqlx9@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index d8e083d..db40906 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -4,9 +4,10 @@
 
 #include <linux/types.h>
 #include <linux/rbtree.h>
-#include "cpumap.h"
 #include "rwsem.h"
 
+struct perf_cpu_map;
+
 struct cpu_topology_map {
 	int	socket_id;
 	int	die_id;