ARM: dts: vexpress: specify AFS partition

This activates the AFS partition parsing on the Versatile
Express family.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/vexpress-v2m-rs1.dtsi

@@ -35,6 +35,9 @@ flash@0,00000000 {
 				reg = <0 0x00000000 0x04000000>,
 				      <4 0x00000000 0x04000000>;
 				bank-width = <4>;
+				partitions {
+					compatible = "arm,arm-firmware-suite";
+				};
 			};
 
 			psram@1,00000000 {

arch/arm/boot/dts/vexpress-v2m.dtsi

@@ -35,6 +35,9 @@ flash@0,00000000 {
 				reg = <0 0x00000000 0x04000000>,
 				      <1 0x00000000 0x04000000>;
 				bank-width = <4>;
+				partitions {
+					compatible = "arm,arm-firmware-suite";
+				};
 			};
 
 			psram@2,00000000 {