drm: Pass 'flags' from the caller to .get_scanout_position()

Preparation for moving the early vblank IRQ logic into
radeon_get_crtc_scanoutpos().

v2: Fix radeon_drv.c compile warning (Mario)

Reviewed-by: mario.kleiner.de@gmail.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

include/drm/drmP.h

@@ -845,6 +845,7 @@ struct drm_driver {
 	 *
 	 * \param dev  DRM device.
 	 * \param crtc Id of the crtc to query.
+	 * \param flags Flags from the caller (DRM_CALLED_FROM_VBLIRQ or 0).
 	 * \param *vpos Target location for current vertical scanout position.
 	 * \param *hpos Target location for current horizontal scanout position.
 	 * \param *stime Target location for timestamp taken immediately before
@@ -867,6 +868,7 @@ struct drm_driver {
 	 *
 	 */
 	int (*get_scanout_position) (struct drm_device *dev, int crtc,
+				     unsigned int flags,
 				     int *vpos, int *hpos, ktime_t *stime,
 				     ktime_t *etime);