drm/vblank: _ioctl posfix for ioctl handler

I alwasy get confused about drm_wait_vblank for a split second until I
realize it's the ioctl handler. Unconfuse me, and do it for the legacy
modeset vblank control ioctl too.

While at it also noticed that I misplaced the irq ioctl handler in the
internal header file.

Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170524145212.27837-12-daniel.vetter@ffwll.ch
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index ba3f5fb..5cf9e03 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -58,12 +58,16 @@ extern unsigned int drm_timestamp_monotonic;
 void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe);
 
 /* IOCTLS */
-int drm_wait_vblank(struct drm_device *dev, void *data,
-		    struct drm_file *filp);
+int drm_wait_vblank_ioctl(struct drm_device *dev, void *data,
+			  struct drm_file *filp);
+int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data,
+				 struct drm_file *file_priv);
+
+/* drm_irq.c */
+
+/* IOCTLS */
 int drm_legacy_irq_control(struct drm_device *dev, void *data,
 			   struct drm_file *file_priv);
-int drm_legacy_modeset_ctl(struct drm_device *dev, void *data,
-			   struct drm_file *file_priv);
 
 /* drm_auth.c */
 int drm_getmagic(struct drm_device *dev, void *data,