perf kvm stat: Replace kvm-stat.h includes with forward declarations

To reduce the include header dependency tree and speed up perf builds.

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-dngwaxuhfnhksawgdpo6e74n@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/powerpc/util/kvm-stat.c

@@ -3,6 +3,7 @@
 #include "util/kvm-stat.h"
 #include "util/parse-events.h"
 #include "util/debug.h"
+#include "util/evsel.h"
 
 #include "book3s_hv_exits.h"
 #include "book3s_hcalls.h"