PBAP check device on disconnect

Upon receiving a disconnect message in Connecting or Connected verify
that the disconnect command is for the current device before
disconnecting.

bug: 28406739
Change-Id: I55498aa01a95c1ab9de1bda21c30db9c241dacc1
(cherry picked from commit 9541d943d7ca14b2e154199eaadce67a4bf12704)