ntb: add missing setup of translation window

The perf tool is missing the setup of translation window. Adding call to
setup the translation window for backed memory.

Signed-off-by: John Kading <john.kading@gd-ms.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>