arm: kirkwood: dts: Add openrd-* dtb makefile build targets

The following Kirkwood dtb build targets are currently missing:

kirkwood-openrd-base.dtb
kirkwood-openrd-client.dtb
kirkwood-openrd-ultimate.dtb

This patch adds them to the Makefile to fix the build error.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 1452fd2..ec89c30 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -54,6 +54,9 @@
 	kirkwood-ns2lite.dtb \
 	kirkwood-ns2max.dtb \
 	kirkwood-ns2mini.dtb \
+	kirkwood-openrd-base.dtb \
+	kirkwood-openrd-client.dtb \
+	kirkwood-openrd-ultimate.dtb \
 	kirkwood-pogo_e02.dtb \
 	kirkwood-sheevaplug.dtb