Revert "Fade in notifications one by one"

Revert submission 13271843-fade-whole-notifications

Reason for revert: b/178142654
Reverted Changes:
Ic49edf84b:Clip view before shelf and leave the rest unclippe...
Iab095bdbd:Fade in notifications one by one

Change-Id: I6527a32d53a734e7b7310790a478275a75261e18
6 files changed