staging: unisys: fix CamelCase-named clearing functions

Fix the CamelCase-named structure clearing functions in
visorchipset_main.c:

busInfo_clear => bus_info_clear
devInfo_clear => dev_info_clear

Update references to use the fixed names.

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