linux/time.h: Add Linux time conversion defines

Currently there are no defines for time conversion in time.h, which
leads to drivers declaring those locally or not using defines at all, so
add them from Linux.

Signed-off-by: Igor Prusov <ivprusov@salutedevices.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/linux/time.h b/include/linux/time.h
index 14ff5b6..14a144d 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -11,6 +11,15 @@
 
 #define _REENT_ONLY
 
+#define MSEC_PER_SEC	1000L
+#define USEC_PER_MSEC	1000L
+#define NSEC_PER_USEC	1000L
+#define NSEC_PER_MSEC	1000000L
+#define USEC_PER_SEC	1000000L
+#define NSEC_PER_SEC	1000000000L
+#define PSEC_PER_SEC	1000000000000LL
+#define FSEC_PER_SEC	1000000000000000LL
+
 #define SECSPERMIN	60L
 #define MINSPERHOUR	60L
 #define HOURSPERDAY	24L