Add flag com.android.window.flags.enable_user_preferred_hdr_mode to trunk_staging.

This change was automatically created by advancing the Gantry workflow at:
https://releasetracker.partner.android.com/changes/dr5i4sm000001?build_unique_id=com.android.window.flags.enable_user_preferred_hdr_mode-platform
Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag.

Bug: 378448831
Flag: com.android.window.flags.enable_user_preferred_hdr_mode
Ignore-AOSP-First: Flag change added internally for future AOSP release
Change-Id: Ic7e1e12c9e668d28fa4cdb0df14229545faf94fd
1 file changed