ramips: use lzma-loader on D-Link DIR-615 H1

Fixes the boot loader LZMA decompression issue:
LZMA ERROR 1 - must RESET board to recover

Signed-off-by: Mirko Parthey <[email protected]>

target/linux/ramips/image/rt305x.mk

@@ -433,6 +433,7 @@ endef
 TARGET_DEVICES += dlink_dir-615-d
 
 define Device/dlink_dir-615-h1
+  $(Device/uimage-lzma-loader)
   SOC := rt3352
   BLOCKSIZE := 4k
   IMAGES += factory.bin