ipq40xx: mikrotik: generate a RouterBOOT v7 NOR compatible sysupgrade

RouterBOOT v7 for NOR devices does not support the historic yaffs
"kernel" ELF boot method.
Generate a compatible kernel

Signed-off-by: John Thomson <[email protected]>

target/linux/ipq40xx/image/mikrotik.mk

@@ -5,9 +5,13 @@ define Device/mikrotik_nor
 	KERNEL_NAME := vmlinux
 	KERNEL := kernel-bin | append-dtb-elf
 	IMAGES = sysupgrade.bin
+	IMAGES += sysupgrade-v7.bin
 	IMAGE/sysupgrade.bin := append-kernel | yaffs-filesystem -L | \
 		pad-to $$$$(BLOCKSIZE) | append-rootfs | pad-rootfs | \
 		check-size | append-metadata
+	IMAGE/sysupgrade-v7.bin := append-kernel | kernel-pack-npk | \
+		yaffs-filesystem -L | pad-to $$$$(BLOCKSIZE) | \
+		append-rootfs | pad-rootfs | check-size | append-metadata
 endef
 
 define Device/mikrotik_nand