staging: unisys: visorbus: remove unused lists

This patch removes the following lists that were never used:
LIST_HEAD(bus_info_list)
LIST_HEAD(dev_info_list)
LIST_HEAD(putfile_request_list)

Signed-off-by: Jon Frisch <jon.frisch@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>