classes-recipe/image_types: Add SPDX_IMAGE_PURPOSE to images

Adds the variable overrides to set the SPDX image purpose for various
image types

(From OE-Core rev: e1a8f59462d88c92dfdb3632ca95ded094c9472a)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes-recipe/image_types.bbclass

@@ -146,6 +146,7 @@ IMAGE_CMD:vfat = "oe_mkvfatfs ${EXTRA_IMAGECMD}"
 IMAGE_CMD_TAR ?= "tar"
 # ignore return code 1 "file changed as we read it" as other tasks(e.g. do_image_wic) may be hardlinking rootfs
 IMAGE_CMD:tar = "${IMAGE_CMD_TAR} --sort=name --format=posix --numeric-owner -cf ${IMGDEPLOYDIR}/${IMAGE_NAME}.tar -C ${IMAGE_ROOTFS} . || [ $? -eq 1 ]"
+SPDX_IMAGE_PURPOSE:tar = "archive"
 
 do_image_cpio[cleandirs] += "${WORKDIR}/cpio_append"
 IMAGE_CMD:cpio () {
@@ -167,6 +168,7 @@ IMAGE_CMD:cpio () {
 		fi
 	fi
 }
+SPDX_IMAGE_PURPOSE:cpio = "archive"
 
 UBI_VOLNAME ?= "${MACHINE}-rootfs"
 UBI_VOLTYPE ?= "dynamic"

meta/classes-recipe/image_types_wic.bbclass

@@ -91,6 +91,7 @@ IMAGE_CMD:wic () {
 	mv "$build_wic/$(basename "${wks%.wks}")"*.${IMAGER} "$out.wic"
 }
 IMAGE_CMD:wic[vardepsexclude] = "WKS_FULL_PATH WKS_FILES TOPDIR"
+SPDX_IMAGE_PURPOSE:wic = "diskImage"
 do_image_wic[cleandirs] = "${WORKDIR}/build-wic"
 
 PSEUDO_IGNORE_PATHS .= ",${WORKDIR}/build-wic"