ARM: dts: am335x: Add the power button interrupt

This enables the power button driver gets corresponding IRQ number by
using platform_get_irq().
Signed-off-by: Milo Kim <woogyom.kim@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-bone-common.dtsi

@@ -324,6 +324,11 @@ charger {
 		status = "okay";
 	};
 
+	pwrbutton {
+		interrupts = <TPS65217_IRQ_PB>;
+		status = "okay";
+	};
+
 	regulators {
 		dcdc1_reg: regulator@0 {
 			regulator-name = "vdds_dpr";