ARM: dts: omap5-igep0050.dts: Use tabs for indentation

And here's another nitpick ;-)

Cc: Agustí Fontquerni i Gorchs <afontquerni@iseebcn.com>
Cc: Enric Balletbo Serra <eballetbo@gmail.com>
Cc: Javier Martinez Canillas <javier@osg.samsung.com>
Cc: Pau Pajuel <ppajuel@gmail.com>
Fixes: b118c6a6ffa1 ("ARM: dts: Add power button support for igepv5")
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>

arch/arm/boot/dts/omap5-igep0050.dts

@@ -20,7 +20,7 @@
 	};
 
 	gpio_keys {
-                compatible = "gpio-keys";
+		compatible = "gpio-keys";
 		pinctrl-0 = <&power_button_pin>;
 		pinctrl-names = "default";