ARM: dts: at91: at91sam9260: add pinctrl label

Add label for pinctrl node.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20210816064416.1630674-2-claudiu.beznea@microchip.com

arch/arm/boot/dts/at91sam9260.dtsi

@@ -166,7 +166,7 @@ tcb1: timer@fffdc000 {
 				clock-names = "t0_clk", "t1_clk", "t2_clk", "slow_clk";
 			};
 
-			pinctrl@fffff400 {
+			pinctrl: pinctrl@fffff400 {
 				#address-cells = <1>;
 				#size-cells = <1>;
 				compatible = "atmel,at91rm9200-pinctrl", "simple-bus";