ARM: dts: gemini: Fix "debounce-interval" property misspelling

"debounce_interval" was never supported.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/arch/arm/boot/dts/gemini-dlink-dir-685.dts b/arch/arm/boot/dts/gemini-dlink-dir-685.dts
index cadde92..369c800 100644
--- a/arch/arm/boot/dts/gemini-dlink-dir-685.dts
+++ b/arch/arm/boot/dts/gemini-dlink-dir-685.dts
@@ -28,7 +28,7 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 		button-esc {
-			debounce_interval = <50>;
+			debounce-interval = <50>;
 			wakeup-source;
 			linux,code = <KEY_ESC>;
 			label = "reset";
@@ -36,7 +36,7 @@
 			gpios = <&gpio0 8 GPIO_ACTIVE_LOW>;
 		};
 		button-eject {
-			debounce_interval = <50>;
+			debounce-interval = <50>;
 			wakeup-source;
 			linux,code = <KEY_EJECTCD>;
 			label = "unmount";