[riot-notifications] [RIOT-OS/RIOT] cpu/nrf/radio/nrfble: request HFXO only on demand (#15806)

Hauke Petersen notifications at github.com
Tue Jan 19 21:24:36 CET 2021

### Contribution description
This is a continuation of #15804 and enables the `nrfble` radio driver to request the external high frequency crystal as clock source only on demand, hence allowing for the CPU to save significant power. 

When combined with #15804 and #15805 this PR will reduce the average current drawn by the `examples/skald_ibeacon` application from ~400µA down to 13µA!!! Thus it makes the difference from running ~3 months to running >5 years on a 1000mAh battery :-)

### Testing procedure
Simply run `examples/skald_ibeacon` on any Nordic board and verify that the node is broadcasting

### Issues/PRs references
Depends on/rebased on  #15804

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-- Commit Summary --

  * cpu/nrf5x: allow to request/release HFXO clk src
  * cpu/nrf/radio/nrf802154: request HFXO clock source
  * cpu/nrf/radio/nrfmin: request HFXO clock source
  * cpu/nrf/radio/nrfble: request HFXO clock source

-- File Changes --

    M cpu/nrf52/radio/nrf802154/nrf802154.c (6)
    M cpu/nrf5x_common/clock.c (34)
    M cpu/nrf5x_common/include/nrf_clock.h (12)
    M cpu/nrf5x_common/radio/nrfble/nrfble.c (6)
    M cpu/nrf5x_common/radio/nrfmin/nrfmin.c (6)

-- Patch Links --


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