[le audio] Broadcast blocks mcp operation device to become active automatically

If broadcast is ongoing, mcp operation PLAY should not trigger the device become active automatically.

Bug: 319939954
Bug: 316005152
Test: atest MediaControlGattServiceTest
Test: manual test with new UI and switch active device during broadcast
Change-Id: Ia568e11c09d41b29d2a79c9794b8a1de4c4f57d6