BLE host: Check HCI handle on ack.
BLE host: Check HCI handle on ack.

This check exposed a blatant bug in our handling of a remote connection
parameter request event.  The code was immediately transmitting HCI packets in
the wrong context, rather than reserving HCI tx slots.

X-Original-Commit: 75d5f52e91a0128fdd5b75d6484318b097e145db

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble