TvSetupCustomization apps

Added 2 customization and validation apps. Partners can use these to
validate the TV Setup partner customization interface. These apps
are not included in the default system image builds.

Also removes the existing SetupCustomizer, which is out-of-date.

Bug: 78910364
Test: manual
Change-Id: Icfb8dea4752100b0cff8d00c36d2e6b5ca0e90cb