Hook up new styles to customization setting

The new styles:
- spritz
- expressive
- vibrant

Are now correctly hooked up to the customization setting, allowing for
picker integration.

Bug: 195969565
Test: atest ThemeOverlayControllerTest
Test: adb shell settings put secure theme_customization_overlay_packages '''\{\"android.theme.customization.system_palette\":\"B1611C\",\"android.theme.customization.theme_style\":\"SPRITZ\"}'''
Change-Id: I106f05b7f0aade470b8216b47e14ca4aa6db0970