Update bcm2cfg.cc to allow for setting binary data

[blimay3581c]

Added the "setb" option for setting binary data from a file.

Perhaps we could overload the existing "set" command line option and introduce another set of flags like --binary and/or --file for the file to read from? Or, maybe having a ifdef in the code? Want to make it as less disruptive as possible.

Thanks,

--B