arm64: dts: meson: add initial device-trees for X96-AIR

Add device-trees for the 2GB/16GB and 4G(32/64GB) variants of the
X96-AIR Android STB device using the Amlogic S905X3 chip.

X96-AIR uses the Realtek RTL8822CS SDIO WiFi+BT module.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>