LU-6030 ldiskfs: clean up ext4-fiemap patch

LU-6030 ldiskfs: clean up ext4-fiemap patch

Move ext4-fiemap patch to osd-ldiskfs. So we can
remove this patch entirely.

Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Change-Id: I639733f6f106398bbc3d5e2ffc6fa8a06ffe867f
Reviewed-on: http://review.whamcloud.com/13571
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>