[Bouncer] Separate keyguard message areas.

Separate keyguard message area between bouncer and alt bouncer. Ensure
that the separation is clear and understandable. Insert
keyguard message area for bouncer into the security view so the layout
is better.

Fixes: 242186543, 240328688
Test: Add unit tests and tested on multiple devices and view modes.
Change-Id: Iff34f1ebe108649c454691d14054072af46bfad8