Bluetooth: Audio: BT_AUDIO_CODEC_LC3_ID -> BT_HCI_CODING_FORMAT_LC3

Replace the BT_AUDIO_CODEC_LC3_ID macro with the
BT_HCI_CODING_FORMAT_LC3 as there is no reason to
define and use the LC3 ID different than the other
allowed codec IDs.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>