Revert "Remove NOTIFICATION_GROUP_EXPANSION_CHANGE flag."

Revert submission 25874661-remove_grp_expansion_flag

Reason for revert: Broken Build 11322568 on git_main on aosp_cheetah-next-userdebug

Reverted changes: /q/submissionid:25874661-remove_grp_expansion_flag

Change-Id: Ib5135c756b47e5301a9d8141c02382e2d20776c0
9 files changed