Letting vold auto choose sd/emmc filesystem makes these errors in logs go away:

E/DirectVolume(  128): Vold managed volumes must have auto mount point; ignoring /storage/sdcard0
E/DirectVolume(  128): Vold managed volumes must have auto mount point; ignoring /storage/sdcard1

Change-Id: Ifde51bc3889e59c3dea8ed20669c27fca19992cc