oniro-image.bbclass: Drop subid backup post rootfs command

Upstream (oe-core) handles now the cleanup directly in the default
sort_passwd post rootfs command.

Merged in oe-core, kirkstone 84b2e9a6c17278cbcc08020aa78759004a7b60bf.
This revision is included in the last oe-core bump.

Related to #772



Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-core/classes/oniro-image.bbclass

@@ -139,16 +139,3 @@ python deploy_boot_artifacts_to_rootfs() {
         run_cmd(install_cmd)
 }
 ROOTFS_POSTPROCESS_COMMAND += "deploy_boot_artifacts_to_rootfs;"
-
-python () {
-    d.appendVar('ROOTFS_POSTPROCESS_COMMAND', ' clean_backup_files; ')
-}
-python clean_backup_files () {
-    # Cleanup other backup files generated by shadow-utils not covered by the
-    # sort_passwd existing rootfs postcommand.
-    # https://gitlab.eclipse.org/eclipse/oniro-core/oniro/-/issues/772
-    import rootfspostcommands
-    for file in ['subuid', 'subgid']:
-        filename = os.path.join(d.expand('${IMAGE_ROOTFS}${sysconfdir}'), file)
-        rootfspostcommands.remove_backup(filename)
-}