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/net/ag7xxx.c b/drivers/net/ag7xxx.c
index 804d5c2..e3a7222 100644
--- a/drivers/net/ag7xxx.c
+++ b/drivers/net/ag7xxx.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <clock_legacy.h>
 #include <cpu_func.h>
 #include <dm.h>
 #include <errno.h>