drm/amd/display: move VGA to HWSS from TG

Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Zeyu Fan <Zeyu.Fan@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>