LU-8510 dne: set osd_obj_ea_ops::dt_invalidate

LU-8510 dne: set osd_obj_ea_ops::dt_invalidate

git commit 226fd401f9d8bfcd1a71bf264d9baef1e0842441 omits setting
dt_invalidate operation for osd_obj_ea_ops.

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Change-Id: I33ae8b7239e056b3fb6981c9bc2dc0ec3c530e15
Reviewed-on: http://review.whamcloud.com/22017
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>