qxl: add fb and ttm entry points for use by suspend/resume.

This just ports some APIs like radeon uses to provide hooks for s/r to
call.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/qxl/qxl_object.c b/drivers/gpu/drm/qxl/qxl_object.c
index d9b12e7..62a046e 100644
--- a/drivers/gpu/drm/qxl/qxl_object.c
+++ b/drivers/gpu/drm/qxl/qxl_object.c
@@ -363,3 +363,8 @@
 		return ret;
 	return 0;
 }
+
+int qxl_surf_evict(struct qxl_device *qdev)
+{
+	return ttm_bo_evict_mm(&qdev->mman.bdev, TTM_PL_PRIV0);
+}