Add SX1278 driver

[ikskuh]

This is the most common LoRa wireless chip.

Product page: https://www.semtech.com/products/wireless-rf/lora-connect/sx1278

Datasheet: https://semtech.my.salesforce.com/sfc/p/#E0000000JelG/a/2R0000001Rc1/QnUuV9TviODKUgt_rpBlPz.EZA_PNK7Rpi8HA5..Sbo