ARM: dts: bcm2711-rpi-ds: Set default I/O pins

Give all the extended I/O interfaces - I2C3-6, SPI3-6 and UART2-5 -
sensible default pinctrl references.

See: #5443

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

arch/arm/boot/dts/bcm2711-rpi-ds.dtsi

@@ -418,6 +418,66 @@
 i2c_arm: &i2c1 {};
 i2c_vc: &i2c0 {};
 
+&i2c3 {
+	pinctrl-0 = <&i2c3_pins>;
+	pinctrl-names = "default";
+};
+
+&i2c4 {
+	pinctrl-0 = <&i2c4_pins>;
+	pinctrl-names = "default";
+};
+
+&i2c5 {
+	pinctrl-0 = <&i2c5_pins>;
+	pinctrl-names = "default";
+};
+
+&i2c6 {
+	pinctrl-0 = <&i2c6_pins>;
+	pinctrl-names = "default";
+};
+
+&spi3 {
+	pinctrl-0 = <&spi3_pins &spi3_cs_pins>;
+	pinctrl-names = "default";
+};
+
+&spi4 {
+	pinctrl-0 = <&spi4_pins &spi4_cs_pins>;
+	pinctrl-names = "default";
+};
+
+&spi5 {
+	pinctrl-0 = <&spi5_pins &spi5_cs_pins>;
+	pinctrl-names = "default";
+};
+
+&spi6 {
+	pinctrl-0 = <&spi6_pins &spi6_cs_pins>;
+	pinctrl-names = "default";
+};
+
+&uart2 {
+	pinctrl-0 = <&uart2_pins>;
+	pinctrl-names = "default";
+};
+
+&uart3 {
+	pinctrl-0 = <&uart3_pins>;
+	pinctrl-names = "default";
+};
+
+&uart4 {
+	pinctrl-0 = <&uart4_pins>;
+	pinctrl-names = "default";
+};
+
+&uart5 {
+	pinctrl-0 = <&uart5_pins>;
+	pinctrl-names = "default";
+};
+
 /delete-node/ &v3d;
 
 / {