nimble/ll: Fix handling HCI ACL data #1983
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For whatever reason HCI ACL packets with empty payload are allowed, but at the same time we are not allowed to send and empty fragment with LLID=0b00 over the air. We need to wait for the 1st non-empty payload and "recombine" it with the empty payload(s) to form a proper payload with LLID=0b00. We don't really need to recombine payloads, instead we can just count and then discard initial empty payloads and the update non-empty payload accordingly. See Core 6.0, Vol 6, Part B, 2.4.1.
We can (and shall) keep sending nocp event with ncp=0 periodically but *only* if we have HCI data packets enqueued. Currently we check if txq is empty but that doesn't take into account that the only queued PDUs may be LL Control. This adds extra counter to track number of data PDUs queued in conn.
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This fixes handling of HCI ACL data in two scenarios: