drm/amd/display: add sharpness support for windowed YUV420 video

drm/amd/display: add sharpness support for windowed YUV420 video

[Why]
Previous only applied sharpness for fullscreen YUV420 video.

[How]
Remove fullscrene restriction and apply sharpness for windowed
 YUV420 video as well.

Reviewed-by: Jun Lei <jun.lei@amd.com>
Signed-off-by: Samson Tam <Samson.Tam@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>