omx: Add nBitsPerSample parameter for FLAC

 * Necessary to convey this information from the extractor.

Change-Id: Ic6f689df9d5f840280bf0410021f6d6ee04a48d5
sensorservice: Add legacy sensors fusion.

This change allows devices with accelerometer & magnetometer but
without gyroscope to still get virtual sensors such as Gravity,
Linear Acceleration, Orientation & Rotation Vector.

Can be enabled with BOARD_USE_LEGACY_SENSORS_FUSION := true

Change-Id: Ibb90b70845c766ab52c843557446e34649a7d6d9