ARM: dts: n8x0: Add vendor prefix to retu node

The retu device node doesn't have a vendor prefix
in its compatible string, fix it by adding one.

Signed-off-by: Javier Martinez Canillas <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Acked-by: Aaro Koskinen <[e-mail]>
Acked-by: Tony Lindgren <[e-mail]>
Reviewed-by: Wolfram Sang <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

arch/arm/boot/dts/omap2420-n8x0-common.dtsi

···
 			#address-cells = <1>;
 			#size-cells = <0>;
 			retu: retu@1 {
-				compatible = "retu";
+				compatible = "nokia,retu";
 				interrupt-parent = <&gpio4>;
 				interrupts = <12 IRQ_TYPE_EDGE_RISING>;
 				reg = <0x1>;