Sensor CTS tests

   i) Add tests for new java API getDefaultSensor(TYPE, wake_up_flag),
      isWakeUpSensor, stringTypes and FIFO counts.
   ii) Test wake-up flags for SMD, proximity, wake-gesture sensors.
   iii) Add more stringent timing requirements for timeStampTest and
        testBatchAndFlush.

Change-Id: I0a3f357d8c2481f1f6398702b9791f5e66fe0c83