herolte: reset paths and gains back to stock values

    * hero2lte and herolte have the mic in different relative
      position, and in stock this is taken into account because gains
      values are different, so we have to use different mic gains per
      model

    * while we are at it, reset all the other mic gains back to stock
      values, since now we have lifevibes audio enhancements enabled

    * gains are taken from stock G930FXXU8ETI2

Change-Id: Ibf32af8ae3dccaf2630fd4960a6b479df5950ec4