staging: unisys: remove obsolete proc entry code

There is an unused variable in the visorchipset_bus_info structure that
used to be for a proc entry, so remove it, and the code that referenced
it. We don't need it anymore.

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