ARM: dts: armada-xp: align SPI node name with dtschema

The node names should be generic and DT schema expects certain pattern.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

arch/arm/boot/dts/armada-xp-lenovo-ix4-300d.dts

@@ -164,7 +164,7 @@ scroll-button {
 		};
 	};
 
-	spi3 {
+	spi-3 {
 		compatible = "spi-gpio";
 		status = "okay";
 		gpio-sck = <&gpio0 25 GPIO_ACTIVE_LOW>;