pnfs-obj: pnfs_osd XDR client implementation

* Add the fs/nfs/objlayout/pnfs_osd_xdr_cli.c file, which will
  include the XDR encode/decode implementations for the pNFS
  client objlayout driver.

[Wrong type in comments]
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

fs/nfs/objlayout/Kbuild

 #
 # Makefile for the pNFS Objects Layout Driver kernel module
 #
-objlayoutdriver-y := objio_osd.o
+objlayoutdriver-y := objio_osd.o pnfs_osd_xdr_cli.o
 obj-$(CONFIG_PNFS_OBJLAYOUT) += objlayoutdriver.o