mips: dts: ralink: mt7621: add phandle to system controller node for watchdog

To allow to access system controller registers from watchdog driver code
add a phandle in the watchdog 'wdt' node. This avoid using arch dependent
operations in driver code.

Reviewed-by: Arınç ÜNAL <[email protected]>
Signed-off-by: Sergio Paracuellos <[email protected]>
Acked-by: Guenter Roeck <[email protected]>
Signed-off-by: Thomas Bogendoerfer <[email protected]>

Author: paraka

arch/mips/boot/dts/ralink/mt7621.dtsi

@@ -73,6 +73,7 @@
 		wdt: watchdog@100 {
 			compatible = "mediatek,mt7621-wdt";
 			reg = <0x100 0x100>;
+			mediatek,sysctl = <&sysc>;
 		};
 
 		gpio: gpio@600 {