aarch64_qemu_boot: Restore build after removing post-image.sh

Use the new image-itb-dl-release to compose a QCOW with Infix and
U-Boot, in the same way that we previously did in post-image.sh.

Author: wkz

configs/aarch64_qemu_boot_defconfig

@@ -21,9 +21,10 @@ BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2023.07.02"
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="qemu_arm64"
 BR2_TARGET_UBOOT_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_INFIX_PATH)/board/common/uboot/extras.config $(BR2_EXTERNAL_INFIX_PATH)/board/aarch64/qemu-uboot/extras.config"
 BR2_TARGET_UBOOT_FORMAT_DTB=y
-BR2_PACKAGE_HOST_GENIMAGE=y
-BR2_PACKAGE_HOST_RAUC=y
 BR2_PACKAGE_HOST_UBOOT_TOOLS=y
 BR2_PACKAGE_HOST_UBOOT_TOOLS_FIT_SUPPORT=y
 BR2_PACKAGE_HOST_UBOOT_TOOLS_FIT_SIGNATURE_SUPPORT=y
-# GNS3_APPLIANCE is not set
+IMAGE_ITB_QCOW=y
+IMAGE_ITB_DL_RELEASE=y
+TRUSTED_KEYS=y
+TRUSTED_KEYS_DEVELOPMENT=y