Allow SysUI to update BubbleMetadata#FLAG_AUTO_EXPAND_BUBBLE

This flag should only really be applied to a notification bubble
one time. Once the bubble has auto-expanded (or if it was posted and
unable to auto-expand at that time due to something like DND), the
flag should be removed so we don't auto-expand it again.

We have a method that allows us to modify some specific flags on
BubbleMetadata. This CL updates that method to be more general and
work with any of the BubbleMetadata flags.

Bug: 226316876
Test: atest NotificationManagerServiceTest
Change-Id: Ib9653ed304f13ac88f489146d503f4de4fa29421