Remove transfer limit on control IN transfers for both Cynthion and GreatFET.

[antoinevg]

At present all Facedancer transfers are packetized which means there is no limit on the amount of data that can be transferred.

The sole exception is Control IN transfers which is not packetized and therefore limited to the size of LIBGREAT_MAX_COMMAND_SIZE.

This affects any Facedancer board that uses libgreat for RPC.