Continued the bypass experience

The lock icon now hides as soon as the notifications are showing
to avoid the overlap introduced in the previous CL.
We're also introducing a new listener that one can listen to
for when the notifications are fully hidden.
That same listener is now used to hide and show the aod icons

Bug: 130327302
Change-Id: I5694a38e542b82bf2738d66bdff28d122a9f89e7