Nordic stack and drivers for the mbed BLE API
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Fix for disconnection callback not called for remote disconnection
This adds the callbacks for the disconnection events Gap::REMOTE_USER_TERMINATED_CONNECTION and Gap::CONN_INTERVAL_UNACCEPTABLE (note though that there is not a perfect match between the NRF SDK disconnection reasons and the BLE_API ones currently). Without this, the BLE examples won't restart advertising after the remote disconnected.