dts: bcm2712-rpi: Add gpiochip0 alias

Add a gpiochip0 aliase pointing to the rp1 GPIO node, making it appear
as gpiochip0.

Signed-off-by: Phil Elwell <[email protected]>

Author: pelwell

arch/arm64/boot/dts/broadcom/bcm2712-rpi.dtsi

@@ -112,6 +112,7 @@
 		gpio2 = &gio_aon;
 		gpio3 = &pinctrl;
 		gpio4 = &pinctrl_aon;
+		gpiochip0 = &gpio;
 		i2c = &i2c_arm;
 		i2c0 = &i2c0;
 		i2c1 = &i2c1;