drm/tegra: Include <linux/of.h>

Include <linux/of.h> to get the contained declarations. No functional
changes.

Signed-off-by: Thomas Zimmermann <[e-mail]>
Reviewed-by: Sui Jingfeng <[e-mail]>
Reviewed-by: Sui Jingfeng <[e-mail]
Signed-off-by: Thierry Reding <[e-mail]>

drivers/gpu/drm/tegra/output.c

···
  * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
  */
 
+#include <linux/of.h>
+
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>

drivers/gpu/drm/tegra/rgb.c

···
  */
 
 #include <linux/clk.h>
+#include <linux/of.h>
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge_connector.h>