Solved it myself! I changed the Device Type to the one found in this thread Linear GD00Z-4 Z-Wave Garage Door Opener and Amazon echo
Since the Go Control Garage Door Opener is the same unit internally as the Linear GD00Z then the device type works as it should for the Go Control unit and allows Echo/Alexa to control the unit using voice commands.
Something to note. There is a built in 30 second delay between commands so that if one issues a voice command to Open Garage Door followed by another command to Close Garage Door then the second command to close garage door will be ignored until at least 30 seconds or more has elapsed from the first command.
Not sure if this is a setting that can be modified in the code to change the delay in seconds , but for now it works if one waits between commands.