ARM: dts: silk: Add compatible property to "partitions" node

As of commit e488ca9f8d4f62c2 ("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 <[e-mail]>
Acked-by: Brian Norris <[e-mail]>
Signed-off-by: Simon Horman <[e-mail]>

arch/arm/boot/dts/r8a7794-silk.dts

···
 		m25p,fast-read;
 
 		partitions {
+			compatible = "fixed-partitions";
 			#address-cells = <1>;
 			#size-cells = <1>;