Added defines for SX126X_RXEN, SX126X_TXEN.

Updated build target to enable privkey import/export.

platformio.ini

@@ -1030,6 +1030,8 @@ build_flags =
   -D BLE_DEBUG_LOGGING=1
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
+  -D ENABLE_PRIVATE_KEY_EXPORT=1
+  -D ENABLE_PRIVATE_KEY_IMPORT=1
 build_src_filter = ${faketec.build_src_filter} +<helpers/nrf52/SerialBLEInterface.cpp> +<../examples/companion_radio/main.cpp>
 lib_deps =
   ${faketec.lib_deps}