bcm53xx: build images for Luxul ABR-4500 and XBR-4500 routers

Luxul ABR-4500 and XBR-4500 devices are wired routers with 5 Ethernet
ports and 1 USB 3.0 port. Flashing requires using Luxul firmware 6.4.0
or newer and uploading firmware using "Firmware Update" web UI page.

Signed-off-by: Dan Haab <dan.haab@legrand.com>

target/linux/bcm53xx/base-files/etc/board.d/02_network

@@ -24,6 +24,13 @@ buffalo,wzr-1750dhp)
 	board_config_flush
 	exit 0
 	;;
+luxul,abr-4500-v1|\
+luxul,xbr-4500-v1)
+	ucidef_add_switch "switch0" \
+		"0:wan" "1:lan:4" "2:lan:3" "3:lan:2" "4:lan:1" "5@eth0"
+	board_config_flush
+	exit 0
+	;;
 phicomm,k3)
 	ucidef_add_switch "switch0" \
 		"0:lan" "1:lan" "2:lan" "3:wan" "5@eth0"

target/linux/bcm53xx/image/Makefile

@@ -83,6 +83,13 @@ define Build/asus-trx
 	mv $@.new $@
 endef
 
+define Build/luxul-lxl
+	$(STAGING_DIR_HOST)/bin/lxlfw create $@.new \
+		-i $@ \
+		-b $(LUXUL_BOARD)
+	mv $@.new $@
+endef
+
 define Build/seama-nand
 	# Seama entity
 	$(STAGING_DIR_HOST)/bin/oseama \
@@ -102,6 +109,7 @@ endef
 
 DEVICE_VARS += PRODUCTID SIGNATURE NETGEAR_BOARD_ID NETGEAR_REGION TPLINK_BOARD
 DEVICE_VARS += BUFFALO_TAG_PLATFORM BUFFALO_TAG_VERSION BUFFALO_TAG_MINOR
+DEVICE_VARS += LUXUL_BOARD
 
 IEEE8021X := wpad-basic
 B43 := $(IEEE8021X) kmod-b43
@@ -262,6 +270,28 @@ define Device/linksys-ea9500
 endef
 # TARGET_DEVICES += linksys-ea9500
 
+define Device/luxul
+  DEVICE_VENDOR := Luxul
+  IMAGES := lxl
+  IMAGE/lxl := append-ubi | trx-nand | luxul-lxl
+endef
+
+define Device/luxul-abr-4500
+  $(Device/luxul)
+  DEVICE_MODEL := ABR-4500
+  DEVICE_PACKAGES := $(USB3_PACKAGES)
+  LUXUL_BOARD := ABR-4500
+endef
+TARGET_DEVICES += luxul-abr-4500
+
+define Device/luxul-xbr-4500
+  $(Device/luxul)
+  DEVICE_MODEL := XBR-4500
+  DEVICE_PACKAGES := $(USB3_PACKAGES)
+  LUXUL_BOARD := XBR-4500
+endef
+TARGET_DEVICES += luxul-xbr-4500
+
 define Device/netgear
   DEVICE_VENDOR := NETGEAR
   IMAGES := chk