Add RequestShortAudioDescriptorAction. [1/2]

When system set system audio mode to on, we sends command
<Request Short Audio Descriptor> to the audio device
in order to get supported format. Otherwise, clear audio format.

And then, we notify audio to update capability and update
audio descriptor in EDID.

Change-Id: I5f1e5e7cfd3b6338bbe3b25ee878724c443de039