nrf52820_hic: configuration clean-ups after nrfx update

nrfx_config_nrf52820.h is converging with default template and reflect usage through nrfx

Author: mbrossard

records/hic_hal/nrf52820.yaml

@@ -21,9 +21,7 @@ common:
         hic_hal:
             - source/hic_hal/nordic/nrf52820
             - source/hic_hal/nordic/nrf52820/cmsis
-            - source/hic_hal/nordic/nrf52820/nrfx
             - source/hic_hal/nordic/nrf52820/nrfx/drivers
-            - source/hic_hal/nordic/nrf52820/nrfx/hal
 
 tool_specific:
     uvision: