dts: bcm2712-ds: Remove bcm7445 from gio_aon

The presence of bcm7445 in the gio_aon compatible strings should be
cosmetic, but it doesn't match gio and it breaks the pinctrl utility.
Standardise on just brcm,bcmstb-gpio, while also making a note to
improve pinctrl.

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

Author: pelwell

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

@@ -627,6 +627,7 @@
 };
 
 &gio_aon {
+	compatible = "brcm,brcmstb-gpio";
 	brcm,gpio-direct;
 };