LU-11310 ldiskfs: Repair support for SUSE 15 GA and SP1

LU-11310 ldiskfs: Repair support for SUSE 15 GA and SP1

At about the same time that support for SLE15 was added, some of the
patches mentioned in the series were removed by a separate patch.

This patch restores correct compiltation for ldiskfs with SUSE 4.12
kernels.

Specifically
     SLE15-LTSS release 4.12.14-150.47
     and 4.12.14-150.22
and
     SLES15-SP1 release 4.12.14-197.37
     and 4.12.14-197.7
which are the current releases as of 2020-apr-21 that  are supported.

Test-Parameters: trivial
Fixes: fc87b01f96e8 ("LU-12477 ldiskfs: remove obsolete ext4 patches")
Fixes: 862e9bf632dc ("LU-11310 ldiskfs: Support for SUSE 15 GA and SP1")
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I76077feec52097345647048cefd2bb375c72e35e
Reviewed-on: https://review.whamcloud.com/38256
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>