bluetooth: controller: openisa/RV32M1: add RPA support

The radio on the VEGA platform will now be able to resolve Resolvable
Private Addresses through the use of the CAUv3 hardware. With this
patch the RPA feature is now fully supported on the Controller:
RPA addresses are generated with local IRK and resolved with
previously exchanged peer IRK.

Signed-off-by: Jeanina Dragusin <ancajeanina.dragusin@nxp.com>