LU-2770 llite: specify ea_size for md_getattr_name

LU-2770 llite: specify ea_size for md_getattr_name

For nfs re-exported case, miss to set ea_size for md_getattr_name(),
then causes the ll_get_parent failure.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I99c8301f9b00cafdf79a6c15541f868f18e4a109
Reviewed-on: http://review.whamcloud.com/5455
Tested-by: Hudson
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>