ramips: fix lzma-loader for ASIARF boards

This fixes a well known "LZMA ERROR 1" error, reported previously on
numerous of similar devices.

Signed-off-by: Daniel Danzberger <[email protected]>

target/linux/ramips/image/mt7621.mk

@@ -237,6 +237,7 @@ TARGET_DEVICES += arcadyan_we420223-99
 
 define Device/asiarf_ap7621-001
   $(Device/dsa-migration)
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 16000k
   DEVICE_VENDOR := AsiaRF
   DEVICE_MODEL := AP7621-001
@@ -247,6 +248,7 @@ TARGET_DEVICES += asiarf_ap7621-001
 
 define Device/asiarf_ap7621-nv1
   $(Device/dsa-migration)
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 16000k
   DEVICE_VENDOR := AsiaRF
   DEVICE_MODEL := AP7621-NV1