LU-4753 endianness: Fix cpu_to_leXX size mismatch

LU-4753 endianness: Fix cpu_to_leXX size mismatch

In lod_prep_md_striped_create() and lod_xattr_set_lmv we use
cpu_to_le32() to transfer __u16 values. This patch replaces
cpu_to_le32() with cpu_to_le16().

Signed-off-by: Swapnil Pimpale <spimpale@ddn.com>
Change-Id: Icc33e3fac711b63cc9d67fcec82dd1b4fdc10cce
Reviewed-on: http://review.whamcloud.com/9637
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>