ipq806x: remove useless case within default case for upgrade

The default case will catch anything left, there is no need to
explicitly add any device to it.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ipq806x/base-files/lib/upgrade/platform.sh

@@ -40,7 +40,6 @@ platform_do_upgrade() {
 		MTD_CONFIG_ARGS="-s 0x200000"
 		default_do_upgrade "$1"
 		;;
-	nec,wg2600hp |\
 	*)
 		default_do_upgrade "$1"
 		;;