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-gxbb-odroidc2.dts b/arch/arm/dts/meson-gxbb-odroidc2.dts
index b46ef98..70fcfb7 100644
--- a/arch/arm/dts/meson-gxbb-odroidc2.dts
+++ b/arch/arm/dts/meson-gxbb-odroidc2.dts
@@ -49,7 +49,7 @@
 
 	leds {
 		compatible = "gpio-leds";
-		blue {
+		led-blue {
 			label = "c2:blue:alive";
 			gpios = <&gpio_ao GPIOAO_13 GPIO_ACTIVE_LOW>;
 			linux,default-trigger = "heartbeat";