perf tools: Add include <linux/kernel.h> where ARRAY_SIZE() is used

To pave the way for further cleanups where linux/kernel.h may stop being
included in some header.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-qqxan6tfsl6qx3l0v3nwgjvk@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/browsers/annotate.c

@@ -10,6 +10,7 @@
 #include "../../util/evsel.h"
 #include "../../util/config.h"
 #include <pthread.h>
+#include <linux/kernel.h>
 
 struct disasm_line_samples {
 	double		percent;