Update max # notifs in NotifPanelViewController

Instead of updating in NotificationViewHierarchyManager. Now both the
old and new pipeline will show the correct # max notifications in
the shade.  This fixes the bug where only a max 3 notifications was
showing in the notification shade when the new notification rendering
pipeline was enabled. (onKeyguard wasn't being updated and the max # of
notifications on the keyguard is 3.)

This fix includes:
- Update ExpandableNotificationRow's keyguard state via status bar state
controller listener instead of relying on a direct call to update from NVHM/StatusBar
- Removing NotificationPresenter getMaxNotificationsWhileLocked method.
Instead, if a package wants to override this value, it should override the config
value keyguard_max_notification_count
- This also fixes regular notification expansion when enabling the
new notification pipeline because now onKeyguard is being updated
appropriately, so the expansion states can evaluate correctly

Test: atest SystemUITests
Change-Id: I07593ef5d95674911f6f96a5c03cf4128a885a99