drm/amdgpu: correct gfx9 csb size

programming pa_sc_raster_config/config1 reg is removed from gfx9 csb
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -1665,8 +1665,6 @@ static u32 gfx_v9_0_get_csb_size(struct amdgpu_device *adev)
 				return 0;
 		}
 	}
-	/* pa_sc_raster_config/pa_sc_raster_config1 */
-	count += 4;
 	/* end clear state */
 	count += 2;
 	/* clear state */