staging: unisys: remove uislib_server_inject_add/del_vnic() prototypes

These functions contain CamelCase names but are not used. Delete the
prototypes from uisutils.h.

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