Platform should automatically control Flash

[terrillmoore]

It should not be necessary for each sketch to control the flash power. This should be done as part of initailization. gCatena.begin() should be enough! All the other stuff is just typing and error prone. The only reason for separate LoRaWAN init is that people might not want the code. But for things that need to be intiialized in a low power mode, gCatena.begin() should be enough.