MIPS: add BMIPS Comtrend AR-5315u board

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/board/comtrend/ar5315u/Makefile b/board/comtrend/ar5315u/Makefile
new file mode 100644
index 0000000..5d2f590
--- /dev/null
+++ b/board/comtrend/ar5315u/Makefile
@@ -0,0 +1,5 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y += ar-5315u.o