LeAudioService: Remove reduntant code

Any limitation on bonded devices should be done in settings.
Without this fix, we could end up having bonded headset which would be
not able to work with LeAudio.

Bug: 324854842
Flag: Exempt, obvious fix removing unecessary limitation
Test: atest LeAudioServiceTest
Change-Id: I65592407fe254feaeca7fb50adec20a9b87e7a7c