configs: aspeed: Add defconfig for AST2600 EVB

Add the default configuration for the AST2600 EVB.

Signed-off-by: Chia-Wei, Wang <chiawei_wang@aspeedtech.com>
Reviewed-by: Ryan Chen <ryan_chen@aspeedtech.com>
diff --git a/board/aspeed/evb_ast2600/MAINTAINERS b/board/aspeed/evb_ast2600/MAINTAINERS
new file mode 100644
index 0000000..e83aae5
--- /dev/null
+++ b/board/aspeed/evb_ast2600/MAINTAINERS
@@ -0,0 +1,6 @@
+EVB AST2600 BOARD
+M:	Chia-Wei, Wang <chiawei_wang@aspeedtech.com>
+S:	Maintained
+F:	board/aspeed/evb_ast2600/
+F:	include/configs/evb_ast2600.h
+F:	configs/evb-ast2600_defconfig