arm64: dts: ulcb: Enable I2C4

This enables I2C4 for ULCB board
Signed-off-by: NVladimir Barinov <vladimir.barinov+renesas@cogentembedded.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

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

@@ -189,6 +189,12 @@
 	};
 };
 
+&i2c4 {
+	status = "okay";
+
+	clock-frequency = <400000>;
+};
+
 &i2c_dvfs {
 	status = "okay";
 };