staging: unisys: fix CamelCase in visorchipset_set_device_context()

Fix CamelCase parameter names:

busNo => bus_no
devNo => dev_no

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