Add cooling device into thermal service

This is for statsd to log new metrics, as statsd has moved to use
thermal service in framework instead of connecting to HAL directly.

Bug: 119688911
Test: Build and dumpsys thermalservice
Test: atest $ANDROID_BUILD_TOP/frameworks/base/services/tests/servicestests/src/com/android/server/power/ThermalManagerServiceTest.java
Change-Id: Ib334c448c3615bf9d1cb0f1b6c2dd8a83d44f371