SCO: codec parameters refactor

* Split CVSD parameters into D1,S3,S4
* Avoid modifying SCO codec parameters after getting from table
* Add comment to SCO codec related code
* Rename HFP ESCO S4 feature flag

Bug: 177049952
Test: atest BluetoothInstrumentationTests
Tag: #refactor
Change-Id: I8c94b80332b73ea768c0618beb87928a12638aa7