ramips: add missing DEVICE_VARS for lzma-loader

LOADER_TYPE is a per-device variable which should be included in
DEVICE_VARS.

Signed-off-by: Chuanhong Guo <[email protected]>

target/linux/ramips/image/Makefile

@@ -7,6 +7,7 @@
 include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/image.mk
 
+DEVICE_VARS += LOADER_TYPE
 DEVICE_VARS += NETGEAR_BOARD_ID NETGEAR_HW_ID
 DEVICE_VARS += BUFFALO_TAG_PLATFORM BUFFALO_TAG_VERSION BUFFALO_TAG_MINOR
 DEVICE_VARS += SEAMA_SIGNATURE SEAMA_MTDBLOCK