Exposing device specific functions for SX126X

[sant0s12]

Hello there,

I was wondering if there is any interest in exposing some of the functions specific to the SX126X since this is not the case at the moment. E.g., it would be nice to have access to the functions for reading and writing registers as well as some of the functions provided in the LoRaMac-node module (like SX126xSetDio2AsRfSwitchCtrl).

For my purposes I just wrote a custom driver that essentially reimplements this functionality but perhaps this repetition could be avoided since the code is already there.

I'm not sure what the criteria is for including device specific APIs, hence why I ask before trying to implement anything :)