Revert "i9500: Increase all mic volumes"

This reverts commit 02f18bbb19fa4d28d024671a9506a1f90d0a296e.

* Apparently this does not result in very good sound quality

Change-Id: I90d3e1b3cd249260b642511657cc8ebfbcc13336
i9500: Reset sound config to default

Change-Id: I38182f3e081c4071ea84b8088a0eeb1853db173c