Added Additional Pin Definitions for sx1276 Radio

[kent-williams]

This PR adds additional pin definitions for the sx1276 radio in the Murata CMWX1ZZABZ-078 module.

I am using the Semtech drivers directly, and not using the MCCI LoRaWAN implementations, so having these definitions helps my pin readability considerably!

-Kent

[kent-williams]

Hello! Anyone able to review this? @terrillmoore
Thanks!

[terrillmoore]

Hi @kent-williams -- sorry, it's been very busy here. I've asked @chwon64 to review. We are planning a new release shortly. I'll also take a look.

[terrillmoore]

Looks good to me as long as we change comments in variant.cpp. 4551 is a puzzle; it doesn't make sense to define RADIO_TCXO on that platform, as TCXO is always on and can't be controlled. This will make things a bit ugly if @kent-williams needs to support all from a single source, but perhaps he can just ignore the 4551 in his code. We ought to consider deprecating, then obsoleting, 4551 support, as it was only used internally at MCCI.

[terrillmoore]

Looks good to me.

[kent-williams]

Would still love to see this get merged if possible!

[kent-williams]

@terrillmoore @chwon64 Can we merge this please?

[terrillmoore]

Thanks @kent-williams !