ARM: mvebu: adjust Armada XP DT spi muxing after pinctrl function rename

Following the merge of "pinctrl: mvebu: armada-xp: rename spi to spi0"
by Linus Walleij, we need to adjust the Armada XP Device Tree
accordingly, by adjusting the pinctrl configuration for SPI pins.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/armada-xp.dtsi

@@ -297,7 +297,7 @@
 	spi0_pins: spi0-pins {
 		marvell,pins = "mpp36", "mpp37",
 			       "mpp38", "mpp39";
-		marvell,function = "spi";
+		marvell,function = "spi0";
 	};
 
 	uart2_pins: uart2-pins {