netdev/phy: mdio-mux-mmioreg.c should include of_address.h

mdio-mux-mmioreg.c uses function of_address_to_resource(), which is defined
in linux/of_address.h.  This fixes a compilation error:

drivers/net/phy/mdio-mux-mmioreg.c: In function 'mdio_mux_mmioreg_probe':
drivers/net/phy/mdio-mux-mmioreg.c:83:2: error: implicit declaration of
	function 'of_address_to_resource'

Reported-by: Randy Dunlap <[email protected]>
Signed-off-by: Timur Tabi <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Timur Tabi

drivers/net/phy/mdio-mux-mmioreg.c

@@ -12,6 +12,7 @@
 
 #include <linux/platform_device.h>
 #include <linux/device.h>
+#include <linux/of_address.h>
 #include <linux/of_mdio.h>
 #include <linux/module.h>
 #include <linux/init.h>