audio: remove invalid audio encoders/decoders

- Remove QCOM software AAC encoder, use Google's
  software AAC encoder.
- Remove redundant encoders(AMRNB/AAC/AMRWB/FLAC)
- Remove EVRC/QCELP/AC3/MP3 HW decoders to pass CTS test
  SW decoders are used for these formats and HW decoders
  are not compiled.

Change-Id: Iecce995a784abee119418b2cd5591de85bceb7f1
CRs-Fixed: 457174

Conflicts:

	configs/media_codecs.xml