ramips: use lzma-loader for Japanese mt7621 devices

In several Japanese routers with MT7621 SoC, the official sysupgrade
image cannot be booted properly after switching to kernel 5.4.

This commit fixes the issue by using lzma-loader.

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>

target/linux/ramips/image/mt7621.mk

@@ -187,6 +187,7 @@ endef
 TARGET_DEVICES += asus_rt-ac85p
 
 define Device/buffalo_wsr-1166dhp
+  $(Device/uimage-lzma-loader)
   IMAGE/sysupgrade.bin := trx | pad-rootfs | append-metadata
   IMAGE_SIZE := 15936k
   DEVICE_VENDOR := Buffalo
@@ -197,6 +198,7 @@ endef
 TARGET_DEVICES += buffalo_wsr-1166dhp
 
 define Device/buffalo_wsr-2533dhpl
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 7936k
   DEVICE_VENDOR := Buffalo
   DEVICE_MODEL := WSR-2533DHPL
@@ -286,6 +288,7 @@ endef
 TARGET_DEVICES += elecom_wrc-1167ghbk2-s
 
 define Device/elecom_wrc-1900gst
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 11264k
   DEVICE_VENDOR := ELECOM
   DEVICE_MODEL := WRC-1900GST
@@ -296,6 +299,7 @@ endef
 TARGET_DEVICES += elecom_wrc-1900gst
 
 define Device/elecom_wrc-2533gst
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 11264k
   DEVICE_VENDOR := ELECOM
   DEVICE_MODEL := WRC-2533GST
@@ -356,6 +360,7 @@ endef
 TARGET_DEVICES += hiwifi_hc5962
 
 define Device/iodata_wn-ax1167gr
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 15552k
   KERNEL_INITRAMFS := $$(KERNEL) | \
 	iodata-factory 7864320 4 0x1055 $(KDIR)/tmp/$$(KERNEL_INITRAMFS_PREFIX)-factory.bin
@@ -414,6 +419,7 @@ endef
 TARGET_DEVICES += iodata_wn-dx1167r
 
 define Device/iodata_wn-gx300gr
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 7616k
   DEVICE_VENDOR := I-O DATA
   DEVICE_MODEL := WN-GX300GR
@@ -422,6 +428,7 @@ endef
 TARGET_DEVICES += iodata_wn-gx300gr
 
 define Device/iodata_wnpr2600g
+  $(Device/uimage-lzma-loader)
   DEVICE_VENDOR := I-O DATA
   DEVICE_MODEL := WNPR2600G
   IMAGE_SIZE := 13952k
@@ -718,6 +725,7 @@ endef
 TARGET_DEVICES += phicomm_k2p
 
 define Device/planex_vr500
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 65216k
   DEVICE_VENDOR := Planex
   DEVICE_MODEL := VR500