ARM: dts: rmobile: Sync Gen3 DTs with Linux 4.19.6

Synchronize DTs with mainline Linux 4.19.6 ,
commit 96db90800c06d3fe3fa08eb6222fe201286bb778

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
---
V2: Rebase on u-boot/master
diff --git a/arch/arm/dts/salvator-x.dtsi b/arch/arm/dts/salvator-x.dtsi
index 468868c..ddee50e 100644
--- a/arch/arm/dts/salvator-x.dtsi
+++ b/arch/arm/dts/salvator-x.dtsi
@@ -1,11 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Device Tree Source for the Salvator-X board
  *
  * Copyright (C) 2015-2016 Renesas Electronics Corp.
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2.  This program is licensed "as is" without any warranty of any
- * kind, whether express or implied.
  */
 
 #include "salvator-common.dtsi"
@@ -20,6 +17,8 @@
 };
 
 &i2c4 {
+	clock-frequency = <400000>;
+
 	versaclock5: clock-generator@6a {
 		compatible = "idt,5p49v5923";
 		reg = <0x6a>;