Log class of device more robustly

This change adds the current class of device to the bonded devices
section of dumpsys. It also adds a "device=" field to several existing
log lines so associating class of device changes with a particular
device is easier.

Bug: 311456944
Flag: EXEMPT, logging only change
Test: m com.android.btservices
Change-Id: Ib4baf3d5f8f756d4e664bde4b278d3c19aca8fff