LU-16286 ldiskfs: reimplement nodelalloc optimization

LU-16286 ldiskfs: reimplement nodelalloc optimization

fiemap calls perform costly delayed extent search affecting
BRW performance, however, in Lustre we don't use delayed
allocation at all. Let's skip this search completely as we did
in RHEL7.

Change-Id: I2c3562cf5cbdf3c5532e4b79b28a040a995322b7
Signed-off-by: Andrew Perepechko <andrew.perepechko@hpe.com>
HPE-bug-id: LUS-11161
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49007
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>