ARM: dts: ls1021: correct indentation

Do not use spaces for indentation.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/ls1021a-moxa-uc-8410a.dts

@@ -30,11 +30,11 @@ sys_mclk: clock-mclk {
 	};
 
 	reg_3p3v: regulator-3p3v {
-		  compatible = "regulator-fixed";
-		  regulator-name = "3P3V";
-		  regulator-min-microvolt = <3300000>;
-		  regulator-max-microvolt = <3300000>;
-		  regulator-always-on;
+		compatible = "regulator-fixed";
+		regulator-name = "3P3V";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
 	};
 
 	leds {