Revert "Improve App notification loading"

Revert "Fix binder error when an app has many channels"

Revert submission 19290255-jr-bind-flicker

Reason for revert: b/240100577
Reverted Changes:
I9a1c96f75:Improve App notification loading
I391ce0b10:Fix binder error when an app has many channels

Change-Id: Iaae40de74d135a79c18201ec17e00f3d9d5f0f3b