staging: unisys: remove last remnants of proc entry code

All of the proc code using easyproc and procobjecttree support is gone,
so we can remove it from the source entirely.

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