drm/amd/display: Remove redundant check in atomic_check

[Why]
We have 2 back-to-back checks for skipping connectors.
Logically one of them will do the job.

[How]
Remove redundant check.
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com&gt;>
Acked-by: Brian Chang <Brian.Chang@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -9380,9 +9380,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
 		struct dm_connector_state *dm_new_con_state = to_dm_connector_state(new_con_state);
 
 		/* Skip connectors that are disabled or part of modeset already. */
-		if (!old_con_state->crtc && !new_con_state->crtc)
-			continue;
-
 		if (!new_con_state->crtc)
 			continue;