Update udfps fade + padding

- Make sure udfps doesn't overlap notification shade
by giving it a 48dp buffer from the notification shade
- Start fading out the udfps icon faster when swiping
up to the bouncer
- Include now playing text in the buffer for the lock icon position

Test: manual
Bug: 192926771
Fixes: 193193900
Change-Id: I3faf73548c9990886237c28d28e7e8b0f9e8686e