LU-6201 llite: remove duplicate fiemap defines

LU-6201 llite: remove duplicate fiemap defines

* replace struct ll_user_fiemap with struct fiemap
* replace struct ll_fiemap_extent with struct fiemap_extent
* remove kernel defined FIEMAP_EXTENT_* constants
* remove kernel defined FIEMAP_FLAG_* flags
* add member prefix for struct ll_fiemap_info_key

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Change-Id: Ib43276fa0c62242d82649c23afce9f7ec707a74a
Reviewed-on: http://review.whamcloud.com/13608
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Yang Sheng <yang.sheng@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>