thermal-hal: Add a fake temperature data for v2 APIs

In GKI builds, some thermal sensors may not be populated. With this
case thermal hal2.0 will return error for v2 APIs. For compliance,
return success with a dummy temperature data, in case sensors are
not available.

Change-Id: I5ab60aabc12b91ae30500eb9935c48f4f99dd75d
1 file changed