LU-10026 csdc: DoM pattern could be a combined value

LU-10026 csdc: DoM pattern could be a combined value

Contains fix from master that was missing on patch landed to b_es6_0.

Fix a minor glitch for lov_getstripe_old code path (in
ll_lov_getstripe_ea_info), which intends to return the last component
stripe info but the commit abf04e7ea3 omits to correctly set the
last component stripe info before using it.

Lustre-change: https://review.whamcloud.com/51978
Lustre-commit: TBD (from dc654837688fc90320601ec12be140b413b044b2)

Fixes: b0b262fe09 ("EX-7806 csdc: set DoM compression component")
Fixes: abf04e7ea3 ("LU-14337 lov: return valid stripe_count/size for PFL files")
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: Id0779c30c004b6979f88bf96b7b7b74a8b8c26e4
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/52171
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>