AUDIO2 MI-MD interface spec.

• 2つ更新、3つ削除 = 25個
• open, close, drain, get_props, get_locks
• query_encoding, set_params, commit_settings
• query_format, init_format (新規追加)
• allocm, freem, round_buffersize, mappage
• init_output, start_output, trigger_output, halt_output
• init_input, start_input, trigger_input, halt_input
• round_blocksize, setfd, dev_ioctl
• speaker_ctl, getdev, set_port, get_port, query_devinfo