LU-5276 ldiskfs: Remove extents-mount-option patch

LU-5276 ldiskfs: Remove extents-mount-option patch

Remove ext4-extents-mount-option.patch for ldiskfs. It
means '-o {extents|noextents}' option not support anymore.

Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Change-Id: I7989fbf9a94c1556728531c7837a887df67e6b19
Reviewed-on: http://review.whamcloud.com/11088
Tested-by: Jenkins
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>