drm/i915: Use pipe config in sprite code

Rather than dig up the pipe source size from crtc->mode, use
intel_crtc->config.requested_mode.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_sprite.c

@@ -652,8 +652,8 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
 		.y2 = crtc_y + crtc_h,
 	};
 	const struct drm_rect clip = {
-		.x2 = crtc->mode.hdisplay,
-		.y2 = crtc->mode.vdisplay,
+		.x2 = intel_crtc->config.requested_mode.hdisplay,
+		.y2 = intel_crtc->config.requested_mode.vdisplay,
 	};
 
 	intel_fb = to_intel_framebuffer(fb);