Remove A2dp offload disabled and LE audio offload enabled combination

In order to reduce the complexity, LE audio offload couldn't be
enabled as a2dp offload disabled. Remove the combination from the
developer option
1. As a2dp offload disabled, LE audio offload couldn't be switched.
2. As the user disable a2dp offload, LE audio offload would be disabled
   as well

Bug: 238268927
Test: make RunSettingsRoboTests ROBOTEST_FILTER=BluetoothLeAudioHwOffloadPreferenceControllerTest
Test: make RunSettingsRoboTests ROBOTEST_FILTER=BluetoothA2dpHwOffloadPreferenceControllerTest
Change-Id: I9ebe26c6a8058798ea654523ad1405a8447268b8
Merged-In: I9ebe26c6a8058798ea654523ad1405a8447268b8
(cherry picked from commit 7cc84502)