Add flag com.android.server.backup.enable_cross_platform_transfer to trunk_staging. This change was automatically created by advancing the Gantry workflow at: https://releasetracker.partner.android.com/changes/fk7r4sq000001?build_unique_id=android_platform_onboarding Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag. Bug: 403956528 Flag: com.android.server.backup.enable_cross_platform_transfer Ignore-AOSP-First: AConfig change for future AOSP release Change-Id: I6c76b96a1389b1a960a045b8dc872d91dea5b5f0