drm/amd/display: Surface Validation Fixes + Audio Mask

1. dc: Adding missing mask for audio register DCCG_AUDIO_DTO_SOURCE
2. Changing the surface validation to check the limits of the clip rect instead of the source rect.

Signed-off-by: Leon Elazar <leon.elazar@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>