Revert "sensors: adding a common convert lib"

Revert submission 2313818-sensors_shared_convert

Reason for revert: Breaks wembley_2GB-userdebug
Reverted Changes:
Icf64c8809:sensorservice: use new convert functions
Ibc6ed5566:libandroid_sensor_headers: make host_supported and...
Ib80130fc0:sensors: adding a common convert lib

Change-Id: I3f4cb4dc228b5bf6f81f451c11c11d6ebf19639a