drm: Make drm_crtc_check_viewport non-static

This function will be used by the universal plane helpers and may also
be useful for individual drivers.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 3894f85..2765a4e 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -882,6 +882,10 @@
 			  bool priv);
 extern void drm_plane_cleanup(struct drm_plane *plane);
 extern void drm_plane_force_disable(struct drm_plane *plane);
+extern int drm_crtc_check_viewport(const struct drm_crtc *crtc,
+				   int x, int y,
+				   const struct drm_display_mode *mode,
+				   const struct drm_framebuffer *fb);
 
 extern void drm_encoder_cleanup(struct drm_encoder *encoder);