EX-6069 ldiskfs: ext4-simple-blockalloc.patch small fixes

EX-6069 ldiskfs: ext4-simple-blockalloc.patch small fixes

The LU-14305 requires cleanup to do.
MB_DEFAULT_MAX_CX_BYTES #defines are not used anymore,
and should be removed.

Also, in the el8 version of the patch for b_es6_0,
the THRESHOLD_BLOCKS() function should explicitly take "sbi"
as a parameter.

Test-Parameters: trivial
Fixes: d5d5cfdde2 ("add persistent tuning for mb_c3_threshold")
Change-Id: Idcb93432fdfa7694b4e7cabbf46a0bf21a412f87
Signed-off-by:Artem Blagodarenko <ablagodarenko@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/48714
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>