Bluetooth: Controller: nrf5_ppi.h: Use nrfx HAL to set PPI always

Quite a few paths used only when there is Coded Phy
support were still setting the PPI directly.
Let's use the nRFx HAL for this so it works properly also
in simulation.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>