Improve tracing for broadcast to registered receiver

Add the classname to the trace log when handling a
broadcast to help identify which class the onReceive() is on.

This is for trace names starting with broadcastReceiveReg

Fixes: 411749780
Test: Take a trace and verify the classname in the trace
Flag: EXEMPT bugfix
Change-Id: I6c74050ac39c61f755946d70c04d0341afd27856