Group all Hearing Aids device information together

A small refactor where the various information about a Hearing Aids
device is gathered into a class. Instead of passing a long list
of function parameters, it is cleaner to group them inside a single
class. It also makes it easier to add new elements in the future.

Test: Manual pair and audio stream with Hearing Aids
Bug: 119617521
Change-Id: I193b5cc915a6c36e7e36d1f06a5adcda7c17ab1c