Expose allowAudioPlaybackCapture to PackageManagerNative

Audio playback has both c++ and java API.
The flag is needed in the audio policy service in c++ to know if the app
can be capture by other apps.

Bug: 119500128
Test: dumpsys media.audio_policy
Change-Id: I949b5e31039b024a34a9646a18586cff5f8807ab
Signed-off-by: Kevin Rocard <krocard@google.com>