LU-17900 llite: handle AT_GETATTR_NOSEC flag if present

LU-17900 llite: handle AT_GETATTR_NOSEC flag if present

Starting with v6.7-rc1-1-g8a924db2d7b5, a new AT_GETATTR_NOSEC
flag can be passed in addition by vfs_getattr_nosec() to the
underlying FS getattr() interface routine.
So it must be handled/masked in ll_vfs_getattr() in order to avoid
to pass it back to vfs_getattr(), like already done by
ecryptfs/overlayfs and thus no longer get a warning/stack displayed.

Signed-off-by: Bruno Faccini <bfaccini@nvidia.com>
Change-Id: I1d041913a6fc3ab9158fd611cb7d14dd1b7f694b
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55296
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Aurelien Degremont <adegremont@nvidia.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>