arm64: dts: renesas: gen3: use 400kHz for I2C DVFS bus

The PMIC and EEPROM can operate at 400kHz, so use this speed.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/salvator-common.dtsi

@@ -474,6 +474,8 @@ adv7482_txb: endpoint {
 &i2c_dvfs {
 	status = "okay";
 
+	clock-frequency = <400000>;
+
 	pmic: pmic@30 {
 		pinctrl-0 = <&irq0_pins>;
 		pinctrl-names = "default";

arch/arm64/boot/dts/renesas/ulcb.dtsi

@@ -241,6 +241,8 @@ versaclock5: clock-generator@6a {
 &i2c_dvfs {
 	status = "okay";
 
+	clock-frequency = <400000>;
+
 	pmic: pmic@30 {
 		pinctrl-0 = <&irq0_pins>;
 		pinctrl-names = "default";