System apps are not allowed to record better then 16kHz mono

This privacy requirement was documented but was not implemented.

Test: atest android.media.cts.AudioPlaybackCaptureTest#testCaptureMediaUsage
Bug: 129948989
Change-Id: I256e6ed1965263416a893393d5462ec73099751e
Signed-off-by: Kevin Rocard <krocard@google.com>