drm/tidss: Don't use drm_device->dev_private

Upcasting using a container_of macro is more typesafe, faster and
easier for the compiler to optimize.

Tested-by: Jyri Sarha <jsarha@ti.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jyri Sarha <jsarha@ti.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200415074034.175360-25-daniel.vetter@ffwll.ch

drivers/gpu/drm/tidss/tidss_kms.c

@@ -25,7 +25,7 @@
 static void tidss_atomic_commit_tail(struct drm_atomic_state *old_state)
 {
 	struct drm_device *ddev = old_state->dev;
-	struct tidss_device *tidss = ddev->dev_private;
+	struct tidss_device *tidss = to_tidss(ddev);
 
 	dev_dbg(ddev->dev, "%s\n", __func__);