Refactor for system helper overlay phase 2.

List of modules included in this cl:
settings-helper
google-settings-helper (Folder and Class struction only; Add as a
sample)

Test: make system-helpers -j40
Test: make AndroidBvtTests -j40
Test: make tv-sysui-app-helper -j40
Test: make TvSettingsTests -j40
Test: make TvSysUiTests -j40
Test: make tv-play-movies-app-helper -j40
Test: make leanback-app-helpers -j40
Test: make Power -j40
Test: make settings-helper -j40
Test: make google-settings-helper -j40
Test: make SettingsFunctionalTests -j40
Test: make LauncherFunctionalTests -j40
Change-Id: I0fdc81c73d5e8e5e5e016a830d3664b4e7568795