Update IPMultimediaPDU.asn to align usage of audioFrame coding with mMCCprotocol coding and usage.
This CR adds comment text to the mMCCprotocol field to dsecribe its usage and application relative to the frameType coding of audioFrame.
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This CR adds comment text to the mMCCprotocol field to dsecribe its usage and application relative to the frameType coding of audioFrame.