sysui: show security footer on the bottom when in split shade mode

When showing the notification shade in split mode, the security footer
should always be shown after the footer. This also updates resources to
have a best usage of configs and dimensions.

Fixes: 188906516
Test: Added tests to QSPanelTest
Change-Id: Iea29490aa73bc4fb3fe3cce82e181a22adca2937