Initialize horizontal panel as GONE and add logs

The horizontal layout view should only be visible when the configuration
has changed to landscape, so it should be initialized as GONE normally.
Also add more logs to help debug if/when this layout changes.

Bug: 198319256
Test: manual, verify correct behavior when rotating

Change-Id: Ic338a0c7772410bdb0964e4686ac0283947e657c
Merged-In: Ic338a0c7772410bdb0964e4686ac0283947e657c
(cherry picked from commit 09855a11)