FOP_ flags: lockd is not sending NLM_GRANTED messages

Benjamin Coddingtonrequested to merge
bcodding/centos-stream-9:RHEL-94440_fixup_NLM_async_callbacks.v1 into main

This MR fixes NLM callbacks by backporting FOP flags to RHEL and then using FOP_ASYNC_LOCK to fix up filesystem signaling for supporting async locks as in the original posting: https://lore.kernel.org/linux-fsdevel/cover.1726083391.git.bcodding@redhat.com/

JIRA: https://issues.redhat.com/browse/RHEL-94440
Signed-off-by: Benjamin Coddington bcodding@redhat.com

Edited by Benjamin Coddington

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