TV: Add PiP content sized views to one FrameLayout

Restructuring of the tv pip menu layout to improve readability. Also
includes some extra comments.

Bug: 241744433
Test: manual - start a PiP and open the menu to see if the views
including the edu text are still shown properly

Change-Id: I2b39b3d251500de4d62d80829affbd8d2b6af42a