ARM: dts: sync amlogic AXG/GXL/GXM DT from Linux 5.8-rc1

This imports the AXG, GXL & GXM SoC and boards DT changes from the Linux
commit b3a9e3b9622a ("Linux 5.8-rc1").

This change also removes GXL & GXM u-boot.dtsi hacks for USB gadget.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/arch/arm/dts/meson-gxm-khadas-vim2.dts b/arch/arm/dts/meson-gxm-khadas-vim2.dts
index 27eeab7..bff8ec2 100644
--- a/arch/arm/dts/meson-gxm-khadas-vim2.dts
+++ b/arch/arm/dts/meson-gxm-khadas-vim2.dts
@@ -380,6 +380,7 @@
 	vref-supply = <&vddio_ao18>;
 };
 
-&usb0 {
+&usb {
 	status = "okay";
+	dr_mode = "peripheral";
 };