Orangepi RV2 Wifi driver

Right now the Orangepi RV2 system image (next variant) expects a Realtek Wifi Chip. That's not the case on this board. The AP6256 WLAN/BT module used by the Orangepi RV2 is based on a BCM43456 chip. It needs the bcmdhd or brcmfmac kernel module and firmware files for proper operation.