[riot-notifications] [RIOT-OS/RIOT] ieee802154/submac: fix initialization code (#16533)

José Alamos notifications at github.com
Mon Jun 7 14:05:04 CEST 2021

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### Contribution description
This PR does essentially 3 things:
- Move some of the initialization code of netdev_ieee802154_submac from `netdev_submac_ieee802154_init` to the actual `_init` function of `netdev_driver_t`. This is required in order to make sure the device is initialized before setting netdev stuff.
- Fix the default SubGHz page
- Call `confirm_set_trx_state` after setting the state to RX_ON during initialization. In some cases, the radio was not ready to do a state transition because `request_set_trx_state` didn't finish.

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### Testing procedure
- Ensure hal dependent radios (cc2538, nrf52840) still work with `gnrc_networking` and `tests/ieee802154_hal`
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### Issues/PRs references
None so far
Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * ieee802154/submac: fix default SubGHz page
  * ieee802154/submac: call confirm_set_trx_state after initialization
  * netdev_ieee802154_submac: fix initialization code

-- File Changes --

    M drivers/netdev_ieee802154_submac/netdev_ieee802154_submac.c (35)
    M sys/net/link_layer/ieee802154/submac.c (3)

-- Patch Links --


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