dts: arm: nordic: Add radio peripheral with DFE antenna config

Add radio peripheral to nrf52833 DTS including antenna matrix
congiuration for Direction Finding extennsion.
Add appropriate binding file for nRF radio peripheral.

There is no default antenna matrix configuration. Antennas number
and GPIOS mapping to DFEGPIOS is project specific.
Complete configuration must be provided by end user as overaly.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>