board: toradex: add Colibri iMX6ULL support

Add support for the Colibri iMX6ULL module which comes with
on-board raw NAND.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
diff --git a/board/toradex/colibri-imx6ull/Makefile b/board/toradex/colibri-imx6ull/Makefile
new file mode 100644
index 0000000..f478e68
--- /dev/null
+++ b/board/toradex/colibri-imx6ull/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright (C) 2018 Toradex AG
+
+obj-y  := colibri-imx6ull.o