arm64: dts: ulcb-kf: enable PCA9548 on I2C4

This supports PCA9548 I2C switch on I2C4 bus on ULCB Kingfisher board
Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

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

@@ -94,6 +94,14 @@ gpio_exp_77: gpio@77 {
 		interrupt-parent = <&gpio5>;
 		interrupts = <9 IRQ_TYPE_EDGE_FALLING>;
 	};
+
+	i2cswitch4: i2c-switch@71 {
+		compatible = "nxp,pca9548";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0x71>;
+		reset-gpios= <&gpio3 15 GPIO_ACTIVE_LOW>;
+	};
 };
 
 &ohci0 {