staging: unisys: remove testing.h

Nobody is using this file so remove it and the reference to it in
visorchipset_main.c.

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>