Check for Enhanced I/O

[heydowns]

If you are using the "Enhanced I/O" mode (truly the enhanced mode, using the DriverStationEnhancedIO class) you can call DriverStationEnhancedIO::GetDigitalConfig() using any legitimate channel number. If the board is not present, it will return DriverStationEnhancedIO::kUnknown.

We had to do this when using the EnhancedIO, wrapping all our runtime EIO calls inside an "if" checking that the Cypress board was plugged in. Without that, repeatedly setting outputs/reading inputs through the DriverStationEnhancedIO would spam errors through to the Driver Station diagnostic window causing poor connectivity between DS and robot.