ARM: dts: at91: sama5d2_ptc_ek: add PB_USER as wakeup source

Add the push button PB_USER as wakeup source
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Link: https://lore.kernel.org/r/20200401221504.41196-3-ludovic.desroches@microchip.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/boot/dts/at91-sama5d2_ptc_ek.dts

@@ -412,6 +412,7 @@ bp1 {
 			label = "PB_USER";
 			gpios = <&pioA PIN_PA10 GPIO_ACTIVE_LOW>;
 			linux,code = <0x104>;
+			wakeup-source;
 		};
 	};