ALSA: hda - Remove leftover snd_hda_bus() prototype

/*

 * constructors

 */

int snd_hda_bus_new(struct snd_card *card,

		    const struct hdac_bus_ops *ops,

		    const struct hdac_io_ops *io_ops,

		    struct hda_bus **busp);

int snd_hda_codec_new(struct hda_bus *bus, struct snd_card *card,

		      unsigned int codec_addr, struct hda_codec **codecp);

int snd_hda_codec_configure(struct hda_codec *codec);