ramips: use destinct 11AC NAS board name

Use a distinct board name even if the board is near to identical to
the WeVO W2914NS v2.

To make sure that a 11AC NAS image can not be installed on a
WeVO W2914NS v2, both board need to use different names.

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/ramips/base-files/lib/ramips.sh

@@ -14,7 +14,7 @@ ramips_board_detect() {
 
 	case "$machine" in
 	*"11AC NAS Router")
-		name="w2914nsv2"
+		name="11acnas"
 		;;
 	*"3G150B")
 		name="3g150b"