drm/msm/dpu: Fix for non-visible planes

Fixes `kms_cursor_crc --run-subtest cursor-offscreen`.. when the cursor
moves offscreen the plane becomes non-visible, so we need to skip over
it in crtc atomic test and mixer setup.

Signed-off-by: Rob Clark <[e-mail]>
Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support")
Reviewed-by: Dmitry Baryshkov <[e-mail]>
Reviewed-by: Abhinav Kumar <[e-mail]>
Patchwork: https://patchwork.freedesktop.org/patch/492819/
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

···
 		if (!state)
 			continue;
 
+		if (!state->visible)
+			continue;
+
 		pstate = to_dpu_plane_state(state);
 		fb = state->fb;
 
···
 			goto end;
 		}
 		if (cnt >= DPU_STAGE_MAX * 4)
+			continue;
+
+		if (!pstate->visible)
 			continue;
 
 		pstates[cnt].dpu_pstate = dpu_pstate;