Bluetooth: Fix to avoid DUN crash due to incorrect readIndex

- Fix to avoid indexOutOfBoundsException due to incorrect
  readIndex in DownlinkThread after reading response from
  Dun Server while disconnecting DUN from PC side.
- Added Dynamic Verbose logging support
- Optimized DUN Service code

Change-Id: Ia7c3392e92e84b9c7e3cbdb62ea0ae9224588b5c
CRs-Fixed: 702364
1 file changed