MIPS: add BMIPS Comtrend AR-5387un board

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/comtrend/ar5387un/Kconfig b/board/comtrend/ar5387un/Kconfig
new file mode 100644
index 0000000..45ab7e2
--- /dev/null
+++ b/board/comtrend/ar5387un/Kconfig
@@ -0,0 +1,12 @@
+if BOARD_COMTREND_AR5387UN
+
+config SYS_BOARD
+	default "ar5387un"
+
+config SYS_VENDOR
+	default "comtrend"
+
+config SYS_CONFIG_NAME
+	default "comtrend_ar5387un"
+
+endif