AudioService: log reason for shouldNotificationSoundPlay false

Always log reasons for why shouldNotificationSoundPlay returns
false, indicating why a notification shouldn't play.

Bug: 337199618
Test: atest android.media.audio.cts.AudioFocusTest#testAudioFocusExclusive
Change-Id: Ia3dcea82bfcb89930cbea635e9d1adeb53f33901