ARM: dts: rockchip: add brcmf node to rk3066a-mk808

The MK808 board has a wifi chip called RK901.
Add a somewhat brcmf compatible node to the rk3066a-mk808.dts file.
That's what's available as driver in the mainline kernel in relation
to this Rockchip wifi product that is able to load the firmware.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/b3c7f1d7-47fd-90e4-badb-e8ceb8901e27@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>