Modify tests for barometer

Update barometer MeanVerification according to Android O CDD update and add InitialValueVerification. The CTS pass on 2016 and 2017 devices.
Test: runtest --path cts/tests/sensor/src/android/hardware/cts/helpers/sensorverification
Test: cts-tradefed run cts --module CtsSensorTestCases --test android.hardware.cts
Bug: 38205487

Change-Id: Id9bf5d282a7ff46e55c1148ff64485236ed04ec1
9 files changed