package/uboot-envtools: add OpenMesh MR1750v2 support

Signed-off-by: Sven Eckelmann <[email protected]>

package/boot/uboot-envtools/files/ar71xx

@@ -25,6 +25,7 @@ eap300v2 | \
 hornet-ub | \
 hornet-ub-x2 | \
 mr1750 | \
+mr1750v2 | \
 mr600 | \
 mr600v2 | \
 mr900 | \