ARM: at91/dt: sama5d3: Add shutdown controller

The SAMA5D3 has a shutdown controller identical to the sam9x5 SoC family.
Declare it in the DT.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/boot/dts/sama5d3.dtsi

@@ -1185,6 +1185,11 @@ rstc@fffffe00 {
 				reg = <0xfffffe00 0x10>;
 			};
 
+			shutdown-controller@fffffe10 {
+				compatible = "atmel,at91sam9x5-shdwc";
+				reg = <0xfffffe10 0x10>;
+			};
+
 			pit: timer@fffffe30 {
 				compatible = "atmel,at91sam9260-pit";
 				reg = <0xfffffe30 0xf>;