Expose different offload audio capabilities by project

The current LE audio offload capabilities is hardcode in the
Bluetooth audio HAL. It has the limitation that all the project
would expose the same capabilities. As the newer project comes,
if the ADSP or the controller could handle more configuration
with higher quality or higher bandwidth. It would impact older
project may not work on it. So we plan the feature to make the
le audio offload support to be more flexible.

Bug: 238983662
Test: 1. atest VtsHalBluetoothAudioTargetTest
      2. make sure offload capabilities can be supported with those
         devices having config XML file
Change-Id: Id82581fdcd22e38108f17c7942bca997b53bab35
Merged-In: Id82581fdcd22e38108f17c7942bca997b53bab35
(cherry picked from commit 8ed901a9)