ARM: dts: OMAP5: uevm: Fix "debounce-interval" property misspelling

"debounce_interval" was never supported.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Benoît Cousson <bcousson@baylibre.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap5-uevm.dts

@@ -47,7 +47,7 @@ btn1 {
 			gpios = <&gpio3 19 GPIO_ACTIVE_LOW>;	/* gpio3_83 */
 			wakeup-source;
 			autorepeat;
-			debounce_interval = <50>;
+			debounce-interval = <50>;
 		};
 	};