ramips: Fix booting on MQmaker WiTi board

This fixes the dreaded "lzma error 1" also reported on similar devices
Ref: https://bugs.openwrt.org/index.php?do=details&task_id=3057

Fixes: FS#3057
Signed-off-by: Daniel Engberg <[email protected]>

target/linux/ramips/image/mt7621.mk

@@ -845,6 +845,7 @@ TARGET_DEVICES += mikrotik_routerboard-m33g
 
 define Device/mqmaker_witi
   $(Device/dsa-migration)
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 16064k
   DEVICE_VENDOR := MQmaker
   DEVICE_MODEL := WiTi