Fix 2402303: Show pmf3k in front of PIN/Password unlock screens.

Fix 2402303: Show pmf3k in front of PIN/Password unlock screens.

This came down to a decision; if we want to show other information (owner id, current playing song, etc.)
as well as continue to have an easy way to silence the device, we need to have two unlock screens in these cases.
We simply don't have enough room on these screens to show anything but the unlock widget and a small bit of text.

This change *does not* affect pattern unlock, which will continue to be a single unlock screen.