perf tools: Move timestamp routines from util.h to time-utils.h

We already have a header for time utilities, so use it.

Link: http://lkml.kernel.org/n/tip-sijzpbvutlg0c3oxn49hy9ca@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/time-utils.h

@@ -1,6 +1,9 @@
 #ifndef _TIME_UTILS_H_
 #define _TIME_UTILS_H_
 
+#include <stddef.h>
+#include <linux/types.h>
+
 struct perf_time_interval {
 	u64 start, end;
 };
@@ -11,4 +14,8 @@ int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr);
 
 bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp);
 
+int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz);
+
+int fetch_current_timestamp(char *buf, size_t sz);
+
 #endif