drm/amd/display: Remove unsupported RGB formats

Do not broadcast (to DRM) unsupported RGB formats.
Signed-off-by: Leo (Sunpeng) Li <sunpeng.li@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_types.c

@@ -1527,11 +1527,6 @@ static const struct drm_plane_helper_funcs dm_plane_helper_funcs = {
  * check will succeed, and let DC to implement proper check
  */
 static uint32_t rgb_formats[] = {
-	DRM_FORMAT_XRGB4444,
-	DRM_FORMAT_ARGB4444,
-	DRM_FORMAT_RGBA4444,
-	DRM_FORMAT_ARGB1555,
-	DRM_FORMAT_RGB565,
 	DRM_FORMAT_RGB888,
 	DRM_FORMAT_XRGB8888,
 	DRM_FORMAT_ARGB8888,