LU-4817 osd: fix some leXX_to_cpu() usage issues

LU-4817 osd: fix some leXX_to_cpu() usage issues

In osd fix some endianness conversion issues, like applying
le16_to_cpu() to an integer literal and calling le64_to_cpu() with a
32-bit value.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I5c4b9b0c6f5695e1c34f8deac25f8a0c5d547e23
Reviewed-on: http://review.whamcloud.com/9825
Tested-by: Jenkins
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>