Add car mode changed listener to DeviceStateMonitor

Since Android Auto is a private display, isScreenOn() can't accurately
determine whether the Android Auto display is on or not. Add a listener
for car mode changed to accurately consider the Android Auto display in
shouldEnableHighPowerConsumptionIndications().
Also add more logs for other states.

Test: atest DeviceStateMonitorTest
Bug: 157257888
Change-Id: Id56899b14f46bcf6ae2d800e53b44aad74a75923