ipq40xx: add eva-image for FRITZ!Box 4040

This commit adds an EVA flashable image for the FRITZ!Box 4040.

The image contains the U-Boot with OpenWRT appended to it. This way we
remove the need to use UART for initial flashing.

Signed-off-by: David Bauer <mail@david-bauer.net>

target/linux/ipq40xx/image/Makefile

@@ -80,7 +80,10 @@ define Device/avm_fritzbox-4040
 	BOARD_NAME := fritz4040
 	DEVICE_TITLE := AVM Fritz!Box 4040
 	IMAGE_SIZE := 29753344
-	IMAGES = sysupgrade.bin
+	UBOOT_PATH := $$(BIN_DIR)/u-boot-fritz4040/uboot-fritz4040.bin
+	UBOOT_PARTITION_SIZE := 524288
+	IMAGES = eva.bin sysupgrade.bin
+	IMAGE/eva.bin := append-uboot | pad-to $$$$(UBOOT_PARTITION_SIZE) | append-kernel | append-rootfs | pad-rootfs
 	IMAGE/sysupgrade.bin := append-kernel | append-rootfs | pad-rootfs | append-metadata
 	DEVICE_PACKAGES := fritz-tffs fritz-caldata u-boot-fritz4040
 endef