sif: cq: tear-down sequence in cleaning up the SendCQ

sif: cq: tear-down sequence in cleaning up the SendCQ

This commit ensures that the sif_fixup_cqes for a sendCQ
can only be executed after post_process_wa4074. As the CQE
in a sendCQ cannot be trusted,  walk_and_update CQ must
be performed first.

In a scenario where the post_process_wa4074 and sif_fixup_cqes
are performed concurrently, the post_process_wa4074 is given
priority where no polling of the SendCQ is allowed in
sif_fixup_cqes. Then, post_process_wa4074 will generate
the remaining FLUSH-IN ERR for a Send queue.

Signed-off-by: Wei Lin Guay <wei.lin.guay@oracle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Knut Omang <knut.omang@oracle.com>