staging: unisys: fix CamelCase in visorchipset_get_device_info()

Fix CamelCase names:

busNo => bus_no
devNo => dev_no
devInfo => dev_info

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