btusb: add support for RTL8723BE

Comes from https://github.com/lwfinger/rtl8723au_bt/tree/new
with added support for the 13d3:3410 USB ID of the adapter
found in the Brix.

[endlessm/eos-shell#2602]
Merge pull request #3 from endlessm/shell/2602

btusb: add support for RTL8723BE