Bluetooth: Audio: Rename codec qos framing

Rename BT_AUDIO_CODEC_QOS_[UN]FRAMED to
BT_AUDIO_CODEC_QOS_FRAMING_[UN]FRAMED and give a name
to the enum, which is then used by the
struct bt_audio_codec_qos.

The rename was needed as we had a codec_qos initializer of the
same name, so the values were renamed to avoid duplicated
macro names.

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