staging/lustre: Remove lustre used memory tracking framework

Lustre memory allocation framework has a feature to track amount
of allocated memory, but since it's not being used consistently anymore
and is on the way out in general, just remove it.

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