audio policy: more concurrent capture fixes

Fix two concurrent capture scenarii when VoIP call is active:
1) when the audio mode is IN_COMMUNICATION, only allow capture
from the app owning the audio mode.
2) fix capture by a privileged app when a privacy sensitive capture is
active: capture was silecend if the privacy sensitive capture was
started after the privileged capture.

Bug: 148368476
Test: Manual test of various VoIP apps and phone calls scenarii
Test: cts AudioRecordTest
Change-Id: I166f91c43ce86bb23c2f171700ece634091caaad