Revert "Audio Effects are not processing first buffer"

This causes a short and loud noise when turning off effects while
an audio track is playing or when an audio track is started with
audio effects enabled. The noise appears to be non-existent if the
volume level is set to its maximum.

This reverts commit d15a8bd1.

Change-Id: I2b8dd3447d673b4b98018710bc10c1eeb282598e