Use code_format transparent for the LE audio software codec

As the codec libray isn't inside the controller, set the coding format
to tranparent (0x03)

Bug: 207104454
Bug: 197297149
Bug: 150670922
Test: connect with LE audio headset, streaming normal
Change-Id: I1c9d29d8e8acfc63c4a81c02a04ffb7f62487caa