Adding flag com.android.systemui.home_controls_dream_hsum to trunk_staging.

This change was automatically created by advancing the Gantry workflow at:
https://releasetracker.partner.android.com/changes/8ebtkfi000001?build_unique_id=ComAndroidSystemuiHomeControlsDreamHsumLaunch-platform
Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag.

Bug: 370691405
Change-Id: I6cd0da60b8908357afdf065043c59f5cd9d8a087
Flag: com.android.systemui.home_controls_dream_hsum
Ignore-AOSP-First: AConfig change for future AOSP release