postproc: Add exceptions for USB digital out

Change-Id: Idc7f926d31e855ea67dedfb579a9757316e3f526
audio: Disabled excessive logging in OMX AACEncoder

- Too many debug logs are enabled in AAC Encoder by default
- Fix is to disable all the logs except the error messages
  and logs indicating loading and unloading of the encoder

Change-Id: If4b37fb654b1c70796bfdc1c839839fab3ea20dc
CRs-Fixed: 619677
Merge commit '5b3cd060fa61821828b55060d9ef5d061006f4af' into cm-11.0