LU-16138 kernel: preserve RHEL8.x server kABI for block integrity

LU-16138 kernel: preserve RHEL8.x server kABI for block integrity

Currently there are two kernel patches supporting SCSI T10-PI feature
left in the RHEL8.x series:

- block-integrity-allow-optional-integrity-functions-rhel8.patch
- block-pass-bio-into-integrity_processing_fn-rhel8.patch

The changes in the patches modified "struct bio_integrity_payload"
and "struct blk_integrity_iter", which caused kABI breakage.

This patch fixes the patches to preserve kABI by using
RH-supplied compatibility macros.

Test-Parameters: trivial fstype=ldiskfs clientdistro=el8.5 serverdistro=el8.5
Test-Parameters: trivial fstype=ldiskfs clientdistro=el8.6 serverdistro=el8.6

Change-Id: If547e1cd4ae4ff1affd315bbfefaeeff4f1dea81
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/48445
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>