drivers/staging/unisys: fix build

drivers/staging/unisys/visorchipset/file.c:31: error: redefinition of typedef 'GUEST_PHYSICAL_ADDRESS'
drivers/staging/unisys/common-spar/include/channels/controlvmchannel.h:23: note: previous declaration of 'GUEST_PHYSICAL_ADDRESS' was here

Cc: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>