ar71xx: simplify TP-LINK model detection

All TP-LINK machine names begin with "TP-LINK", so there's no need to check for
more specific model names. This also allows adding new models like the Archer
series more easily.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

SVN-Revision: 42795

target/linux/ar71xx/base-files/lib/ar71xx.sh

@@ -750,11 +750,7 @@ ar71xx_board_detect() {
 		;;
 	esac
 
-	case "$machine" in
-	*TL-WR* | *TL-WA* | *TL-MR* | *TL-WD*)
-		tplink_board_detect "$machine"
-		;;
-	esac
+	[ "${machine:0:8}" = 'TP-LINK ' ] && tplink_board_detect "$machine"
 
 	[ -z "$name" ] && name="unknown"