Add support for SX1262 based TBEAMs, see below for more details.

We probe dynamically for the SX1262 or RF95 based radios on TBEAM1.0
boards now.  If either is present it will be used.

src/mesh/RadioLibInterface.cpp

@@ -13,7 +13,6 @@ RadioLibInterface::RadioLibInterface(RADIOLIB_PIN_TYPE cs, RADIOLIB_PIN_TYPE irq
                                      SPIClass &spi, PhysicalLayer *_iface)
     : concurrency::PeriodicTask(0), module(cs, irq, rst, busy, spi, spiSettings), iface(_iface)
 {
-    assert(!instance); // We assume only one for now
     instance = this;
 }