MediaControl: Limit the unauthorized device state reads

Do not disclose the supported opcodes and playback state to the
unauthorized devices. Otherwise they may assume it is ok for them to
control the playback. However any request will be rejected, which may
confuse them.

Bug: 284028276
Test: atest BluetoothInstrumenatationTests
Change-Id: I051cb5d1ab1acae4dbca9ed3f6048d5bd52e4dc3