common: Move clock functions into a new file
These three clock functions don't use driver model and should be migrated.
In the meantime, create a new file to hold them.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/serial/serial_ar933x.c b/drivers/serial/serial_ar933x.c
index 5249c55..897ea5d 100644
--- a/drivers/serial/serial_ar933x.c
+++ b/drivers/serial/serial_ar933x.c
@@ -4,6 +4,7 @@
*/
#include <common.h>
+#include <clock_legacy.h>
#include <dm.h>
#include <div64.h>
#include <errno.h>