Add CTS to verify Z axis of accelerometer in Car is pointing upward.

Adds check in mean verification to check the accelerometer reading is [0, 0, 9.8].
This verifies the Z axis points upward as per android automotive axis.
https://source.android.com/devices/sensors/sensor-types#auto_axes
X and Y axis directions are not verified.

Bug: 120840410

Change-Id: I10c30a46732ceb10fd3da1690f02ba8382bc41d9
Test: atest CtsSensorTests:SingleSensotTest