staging: unisys: remove unused types from visorchipset.h

Delete the following unused types, and unused function prototypes:

VISORCHIPSET_SWITCH_INFO
VISORCHIPSET_EXTERNALPORT_INFO
VISORCHIPSET_INTERNALPORT_INFO
visorchipset_get_switch_info()
visorchipset_get_externalport_info()

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