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[9.20] chg: dev: call rcu_barrier() in the isc_mem_destroy() just once

bind-team-rw-api-rw-repo requested to merge backport-4607-call-a-single-rcu_barrier-9.20 into bind-9.20

The previous work in this area was led by the belief that we might be calling call_rcu() from within call_rcu() callbacks. After carefully checking all the current callback, it became evident that this is not the case and the problem isn't enough rcu_barrier() calls, but something entirely else.

Call the rcu_barrier() just once as that's enough and the multiple rcu_barrier() calls will not hide the real problem anymore, so we can find it.

Backport of MR !9134 (merged)

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