Sanitize more of the notification text fields

Test: manual; monitor SystemUI performance when an app tries to
post a messaging style notification with messages with long text
Bug: 158304295
Bug: 147358092

Merged-In: c953fdf6
Change-Id: I0e2ea12fc3351b1a56645b556720ea2306f5422a
(cherry picked from commit c953fdf6)