aspeed: Support for ast2500 Eval Board

ast2500 Eval Board device tree and board specific configuration.
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 6a7924e..9ac5862 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -334,6 +334,8 @@
 	bcm2836-rpi-2-b.dtb \
 	bcm2837-rpi-3-b.dtb
 
+dtb-$(CONFIG_ARCH_ASPEED) += ast2500-evb.dtb
+
 targets += $(dtb-y)
 
 # Add any required device tree compiler flags here