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 remote-tracking branch 'cm/cm-11.0' into HEAD