dt-bindings: arm: amlogic: add support for the WeTek Core 2

dt-bindings: arm: amlogic: add support for the WeTek Core 2

The WeTek Core 2 is a commercial Android device based on the Amlogic Q200
reference design using the S912-H chipset. Specs:

3GB DDR3 RAM
32GB eMMC storage
10/100 Ethernet using Realtek RTL8152 (internal USB)
802.11 a/b/g/n/ac + BT 4.1 sdio wireless module (AP6356S)
2x single colour LEDs to indicate power
1x power button
1x reset button on the underside of the box
HDMI 2.0 (4k@60p) video
Composite video + 2-channel audio output on 3.5mm jack
S/PDIF audio output
2x USB 2.0 ports
1x USB OTG port (internal)
1x micro SD card slot
UART pins (internal)
IR Sensor

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20200719021421.7959-2-christianshewitt@gmail.com