Introduce a system APC with its corresponding opt-out

For system application with the new permission CAPTURE_MEDIA_OUTPUT, or
CAPTURE_AUDIO_OUTPUT, allow to capture the audio of playing apps that
allow it.

Test: adb shell audiorecorder --target /data/file1.raw
Test: atest android.media.cts.AudioPlaybackCaptureTest
Bug: 111453086
Change-Id: I5bfca51e48992234508897c595a076d066db26b2
Signed-off-by: Kevin Rocard <krocard@google.com>