Updating CarDrivingStateMonitor to use broadcast

Before the CarDrivingStateMonitor used a registering receviers approach
to notifying other applications (namely the base CarSetupWizard
package). This is pretty much exactly what a broadcast receiver is
intended for between applications so I am changing this interface.

Change-Id: I48384bb93a356a3c4c021ec5b9330258842bd5fd
Fixes:120678634
Test: Updated tests to ensure broadcast is sent