Revert "Sensor: Add RotationVectorSensor2"

The implementation does not work as-is and the latest version of
Google Maps no longer needs it.

This reverts commit 45c5aa0ce71904ad8b00d5eba0627770b35b03ab.

Change-Id: I89b3730e93eb774dc2b9dace645d08cbfb311647
Merge "Revert "Sensor: Add RotationVectorSensor2"" into cm-11.0
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_frameworks_native into kk44