Update Novatel_OEM615 for Hardware Accuracy

[kevincbruce]

The Novatel_OEM615 device seems to have some layover code from Sample, specifically around HK and config commands, where they seem to be set up similarly/the same to sample, but without some necessary distinctions set up (command codes don't seem referenced, split off in a different CommandDevice method from the CommandDeviceCustom method that has the rest of the real commands (log, unlog, unlog-all). The necessity of device HK and config should be reevaluated, and the methods should be cleaned up, consolidated, and fixed as necessary.

Running with cFS, it seems that the Device Count works, Device Counter sticks at 0, and Device Error Count rapidly increases from 0 to near 256 (max count? Not sure) before resetting to 0. This behavior all seems improper.