staging: unisys: remove unneeded functions

these functions are not being used anywhere.so we can remove them.
has been verified by "git grep" that they are not being referenced
anywhere also has been build tested.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>