LU-6142 uapi: Fix style issues for lustre_idl.h

LU-6142 uapi: Fix style issues for lustre_idl.h

This patch fixes issues reported by checkpatch
for file lustre/include/uapi/linux/lustre/lustre_idl.h

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I6031ca0dd9b0cf7b5503ff92431f391548af8f0d
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53985
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alexandre Ioffe <aioffe@ddn.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>