staging: unisys: refactor VISORCHIPSET_BUSDEV_RESPONDERS

Get rid of the typedef and just use struct visorchipset_busdev_responders
instead. Fix CamelCase parameter names in the function pointer definitions for
the structure:

busNo => bus_no
devNo => dev_no

Update references to changed names.

Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>