ARM: dts: stout: Add DA9063 OnKey node

Add DA9063 OnKey subnode to DA9063 PMIC node on Stout.
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7790-stout.dts

@@ -318,6 +318,10 @@ pmic@58 {
 		interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
 		interrupt-controller;
 
+		onkey {
+			compatible = "dlg,da9063-onkey";
+		};
+
 		rtc {
 			compatible = "dlg,da9063-rtc";
 		};