this is another board from ruiside, tested uart, button, led, sdram, sd card Signed-off-by: Shan Pen <bricle031@gmail.com>
- introduced a new vendor ruiside, updated `dts/bindings/vendor-prefixes.txt` - add art-pi2 board basic support Signed-off-by: Shan Pen <bricle031@gmail.com>