LU-9868 llite: remove lld_it field of ll_dentry_data

LU-9868 llite: remove lld_it field of ll_dentry_data

This field is never set nor used.  Let's remove it.

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: If01ba4deec34a6528b3c36c45a378b9f3824ca2f
Reviewed-on: https://review.whamcloud.com/37741
Reviewed-by: Wang Shilong <wshilong@ddn.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>