aspeed: Support for ast2500 Eval Board

ast2500 Eval Board device tree and board specific configuration.
Reviewed-by: Simon Glass <sjg@chromium.org>

board/aspeed/evb_ast2500/Kconfig

@@ -0,0 +1,12 @@
+if TARGET_EVB_AST2500
+
+config SYS_BOARD
+	default "evb_ast2500"
+
+config SYS_VENDOR
+	default "aspeed"
+
+config SYS_CONFIG_NAME
+	default "evb_ast2500"
+
+endif

board/aspeed/evb_ast2500/Makefile

@@ -0,0 +1 @@
+obj-y += evb_ast2500.o

board/aspeed/evb_ast2500/evb_ast2500.c

@@ -0,0 +1,6 @@
+/*
+ * Copyright (c) 2016 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>