LU-14020 ldiskfs: SUSE 15 SP2 and mainline 5.4.21 and newer

LU-14020 ldiskfs: SUSE 15 SP2 and mainline 5.4.21 and newer

The updated pdirop for Ubuntu 5.4.0-42 kernel also aligns
with Linux LTS 5.4.21 through to current 5.4.60

In addition this series is also suitable for the current
SUSE 15 SP2 kernel, tested with 5.3.18-24.15.

Test-Parameters: trivial
HPE-bug-id: LUS-9092
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I75ee53c4096b31c3a2d13748401ed1a12306215b
Reviewed-on: https://review.whamcloud.com/40179
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>