Require consistent getSensorsList

Require that the values returned from getSensorsList do not change
before the entire system reboots. The values must be stable even
across Sensors HAL restarts. This allows for the framework to
automatically re-establish connections if the Sensors HAL crashes.

Bug: 111070257
Test: Compiles
Change-Id: I0e4b7d6ef8f89f6780c6a14d67465fd3692cd482