Update libbitfury.h

minor changes
Update driver-bitfury.c
Update libbitfury.c

frequency setting
Update libbitfury.h

more banks
Update api.c

"setclkb" api command added
Update libbitfury.h
Update api.c
Update api.c
Merge pull request #1 from protonevil/api_overclock_feature

api_overclock_feature