ramips: fix mqmaker witi case in fixup-mac-address

This commit fixes a forgotten case in previous commit.

Fixes: 087e14ab59 ("ramips: mt7621: merge two variants of MQmaker WiTi together")
Signed-off-by: Chuanhong Guo <[email protected]>

target/linux/ramips/base-files/sbin/fixup-mac-address

@@ -9,8 +9,7 @@ YES=
 
 board=$(board_name)
 case $board in
-	mqmaker,witi-256m|\
-	mqmaker,witi-512m)
+	mqmaker,witi)
 		partname=factory
 		offset=$((0xe000))
 	;;