imx8mn: synchronise device tree with linux

Synchronise device tree with linux v6.1-rc3.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Tested-By: Tim Harvey <tharvey@gateworks.com> #imx8m{m,n,p}-venice-*
diff --git a/arch/arm/dts/imx8mn-var-som-symphony.dts b/arch/arm/dts/imx8mn-var-som-symphony.dts
index f61c487..3ed7021 100644
--- a/arch/arm/dts/imx8mn-var-som-symphony.dts
+++ b/arch/arm/dts/imx8mn-var-som-symphony.dts
@@ -26,19 +26,19 @@
 	gpio-keys {
 		compatible = "gpio-keys";
 
-		back {
+		key-back {
 			label = "Back";
 			gpios = <&pca9534 1 GPIO_ACTIVE_LOW>;
 			linux,code = <KEY_BACK>;
 		};
 
-		home {
+		key-home {
 			label = "Home";
 			gpios = <&pca9534 2 GPIO_ACTIVE_LOW>;
 			linux,code = <KEY_HOME>;
 		};
 
-		menu {
+		key-menu {
 			label = "Menu";
 			gpios = <&pca9534 3 GPIO_ACTIVE_LOW>;
 			linux,code = <KEY_MENU>;