board: nx25-ae250: Rename as ax25-ae350

Rename
 nx25 as ax25
 ae250 as ae350
 nx25-ae250 as ax25-ae350
 including filename, variable, string and definition.

Signed-off-by: Rick Chen <rick@andestech.com>
Signed-off-by: Rick Chen <rickchen36@gmail.com>
Cc: Greentime Hu <green.hu@gmail.com>
diff --git a/board/AndesTech/ax25-ae350/Makefile b/board/AndesTech/ax25-ae350/Makefile
new file mode 100644
index 0000000..0e4ba8d
--- /dev/null
+++ b/board/AndesTech/ax25-ae350/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2017 Andes Technology Corporation.
+# Rick Chen, Andes Technology Corporation <rick@andestech.com>
+
+obj-y	:= ax25-ae350.o