LeAudio: Correct header inclusion chain for le_audio_types.h

This file is included by multiple modules and should not include
any redundant headers, adding more dependencies than needed.
The other modules should rather directly include headers for the
API they use.

Bug: 295972694
Test: atest bluetooth_le_audio_test bluetooth_le_audio_client_test  bluetooth_test_broadcaster bluetooth_test_broadcaster_state_machine
Change-Id: Iaa1876ff6279fa2d979c65fdb2182a405d395a2b