[source] package/uboot-envtools: add OpenMesh A40 support

[LEDE Commits]

blogic pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/d6d9f256ff27c1d1631d23683454ecde68e6e249

commit d6d9f256ff27c1d1631d23683454ecde68e6e249
Author: Sven Eckelmann <sven.eckelmann at open-mesh.com>
AuthorDate: Fri Sep 23 09:38:34 2016 +0200

    package/uboot-envtools: add OpenMesh A40 support
    
    Signed-off-by: Sven Eckelmann <sven.eckelmann at open-mesh.com>
---
 package/boot/uboot-envtools/files/ar71xx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/boot/uboot-envtools/files/ar71xx b/package/boot/uboot-envtools/files/ar71xx
index 6610dbb..3a5d269 100644
--- a/package/boot/uboot-envtools/files/ar71xx
+++ b/package/boot/uboot-envtools/files/ar71xx
@@ -14,6 +14,7 @@ touch /etc/config/ubootenv
 board=$(ar71xx_board_name)
 
 case "$board" in
+a40|\
 a60|\
 alfa-ap120c|\
 all0258n|\