staging: lustre: clean up some proc file declarations

This removes the DECLARE_PROC_HANDLER macro, and makes proc_call_handler
a static function (horrible name to be in a module).  This makes the
linux-prim.h file empty now, so it can be removed soon.

Cc: Andreas Dilger <andreas.dilger@intel.com>
Cc: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>