ARM: mvebu: ix4-300d: Add compatible property to "partitions" node

As of commit e488ca9f ("doc: dt: mtd: partitions: add compatible
property to "partitions" node"), the "partitions" subnode of an SPI
FLASH device node must have a compatible property. The partitions are no
longer detected if it is not present.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

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

@@ -152,6 +152,7 @@ nand@d0000 {
 				nand-on-flash-bbt;
 
 				partitions {
+					compatible = "fixed-partitions";
 					#address-cells = <1>;
 					#size-cells = <1>;