Fix LeAudioService permission check

Add and remove permission check logic based on the annotation of
@RequirersPermission in BluetoothLeAudio and BluetoothLeBroadcast
classes.

Bug: 238062347
Test: atest BluetoothLeAudioTest BluetoothLeBroadcastTest
Tag: #refactor
Change-Id: I13bb1fb330c290082a264476fbc35bc25f71cad7
(cherry picked from commit bf0458d0)