arm64: dts: amlogic: add initial Odroid Go Ultra DTS

This adds initial support for the Hardkernel Odroid Go Ultra.

The Odroid Go Ultra is a portable gaming device with the following
characteristics:
- Amlogic S922X SoC
- RK817 & RK818 PMICs
- 2GiB LPDDR4
- On board 16GiB eMMC
- Micro SD Card slot
- 5inch 854×480 MIPI-DSI TFT LCD
- Earphone stereo jack, 0.5Watt 8Ω Mono speaker
- Li-Polymer 3.7V/4000mAh Battery
- USB-A 2.0 Host Connector
- x16 GPIO Input Buttons
- 2x ADC Analog Joysticks
- USB-C Port for USB2 Device and Charging

The following are not yet handled:
- Battery RK818 Gauge and Charging
- Earphone stereo jack detect
- 5inch 854×480 MIPI-DSI TFT LCD

Link: https://lore.kernel.org/r/20221031-b4-odroid-go-ultra-initial-v2-2-a3df1e09b0af@linaro.org


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>