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/ns16550.c b/drivers/serial/ns16550.c
index 754b6e9..a92d2b1 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -4,6 +4,7 @@
* modified to use CONFIG_SYS_ISA_MEM and new defines
*/
+#include <clock_legacy.h>
#include <common.h>
#include <clk.h>
#include <dm.h>