Bluetooth: AVDTP: Fix trees and distinguish local and remote SEPs

Bluetooth: AVDTP: Fix trees and distinguish local and remote SEPs

When there is more then one interface or adapter then AVDTP dissector
incorrectly mixing it data together. Patch extends keys to support
multiple interfaces/adapters. Also do little simplification on trees.

There are two device, both use SEPs to configuration and
it is possible to use the same SEID. SetConfiguration use
remote "ACP" SEID and local "INT" SEID, so there is need to
distinguish them and please remember then INT SEID types can be
unknown in most case.

Change-Id: I150f3625f532386a1078deb8d0ac70a1c05c3f04
Reviewed-on: https://code.wireshark.org/review/473
Reviewed-by: Evan Huus <eapache@gmail.com>