Revert "Downscale large bitmaps in CachingIconView"

Revert submission 17083643-large-icons-tm

Reason for revert: Speculative revert for android.app.cts.NotificationManagerTest breakage.
Reverted Changes:
Ib66933a8f:Size restrict right notification icon size
If3d871e78:Downscale large bitmaps in CachingIconView
I504694cb2:Support downscaling of Drawable icons in LocalImag...

Bug: 224768026
Change-Id: Iabb2d26899979aff25afa095baacd6bae12f6fde