drivers/sx127x: use netdev_register()

[fabian18]

Contribution description

I added the call to netdev_register() in sx127x_setup().

Testing procedure

The test tests/driver_sx127x runs.

2020-12-01 16:35:39,176 # main(): This is RIOT! (Version: 2021.01-devel-1206-gc526a-sx127x_netdev_register)
2020-12-01 16:35:39,209 # Initialization successful - starting the shell now
> help
2020-12-01 16:35:42,831 #  help
2020-12-01 16:35:42,834 # Command              Description
2020-12-01 16:35:42,838 # ---------------------------------------
2020-12-01 16:35:42,843 # setup                Initialize LoRa modulation settings
2020-12-01 16:35:42,846 # implicit             Enable implicit header
2020-12-01 16:35:42,849 # crc                  Enable CRC
2020-12-01 16:35:42,854 # payload              Set payload length (implicit header)
2020-12-01 16:35:42,859 # random               Get random number from sx127x
2020-12-01 16:35:42,862 # syncword             Get/Set the syncword
2020-12-01 16:35:42,866 # rx_timeout           Set the RX timeout
2020-12-01 16:35:42,871 # channel              Get/Set channel frequency (in Hz)
2020-12-01 16:35:42,876 # register             Get/Set value(s) of registers of sx127x
2020-12-01 16:35:42,880 # send                 Send raw payload string
2020-12-01 16:35:42,884 # listen               Start raw payload listener
2020-12-01 16:35:42,888 # reset                Reset the sx127x device
2020-12-01 16:35:42,891 # reboot               Reboot the node
2020-12-01 16:35:42,895 # version              Prints current RIOT_VERSION
2020-12-01 16:35:42,900 # pm                   interact with layered PM subsystem
2020-12-01 16:35:42,906 # ps                   Prints information about running threads.
> send
2020-12-01 16:35:55,850 #  send
2020-12-01 16:35:55,852 # usage: send <payload>
> send hi
2020-12-01 16:35:58,990 #  send hi
2020-12-01 16:35:58,993 # sending "hi" payload (3 bytes)
> 2020-12-01 16:35:59,028 #  Transmission completed

Issues/PRs references

To benefit from gnrc_netif_get_by_type() in #15120
see also: #15532

[fabian18]

@maribu