Fix bug 3376700 Volume too loud at lowest setting
Fix bug 3376700 Volume too loud at lowest setting

Change volume attenuation curve to provide more attenuation at
 low volume settings, and finer steps at high volume.
See bug entry for link to doc with curve values.

Change-Id: I750548b2161a4c550ef982ba793156e4518119e8

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base