bitfury: Set poll interval to start iteration before responses are processed
drv_set_defaults wrapper function around cgpu_set_defaults for use with options that may need to be set during probe
bitfury: Split out SPI port configuration option ("baud") to its own function
bitfury: Use drv_set_defaults to enable setting baud before probe
Merge commit 'b4a4049' into bfgminer