clk: Add missing <dm/device.h> to include/clk.h

In this header we make direct references to some dm/device.h functions
while not including the header directly. Add the missing include.

Signed-off-by: Tom Rini <trini@konsulko.com>

include/clk.h

@@ -9,6 +9,7 @@
 #define _CLK_H_
 
 #include <dm/ofnode.h>
+#include <dm/device.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/types.h>