Add log for atrac3+ audio

It simply shows "This is an atrac3+ audio" when detects PSP_MODE_AT_3_PLUS codec , nothing else but in yellow color so we easy to see it in debug log .

![log](https://f.cloud.github.com/assets/3000282/488834/eca8385c-b988-11e2-964a-fca4b7f345ae.jpg)
 .