Add support for overclocking

[philipstarkey]

It should be reasonably simple to bring the overclocking support over from the PrawnBlaster. #16 will add much of the required cmake config to do so, we'll just need to:

• Change the overclocks list value from 0; to 0;1 in the cmake file
• Update the build.yaml file to include the additional firmware files generated
• Update the C code to disable the check on the upper bound of the frequency based on the compiler definition set in the cmake file (like we do for the PrawnBlaster)

Unless I'm missing something, I think that will be it!