Try default wallpaper component if no device color

Pre DVT device doesn't have ro.boot.hardware.color, instead of using
the default ImageWallpaper, try to use default_wallpaper_component
if there is one.

Bug: 293145929
Test: flash with no device color and observe the default wallpaper
Change-Id: I5256da2f36c4a079f35f857ad091306f7166bceb