Audio: add system usage to audio policy engine schemas

Bug: 293917986
Test: m

Change-Id: I49a8d3cfeb45eddc95ad6ab4a33b0adf0585cde2
Signed-off-by: François Gaffie <francois.gaffie@renault.com>
(cherry picked from commit acd4a677f01f7e9674e07be27aabbc3d8a5cb84d)
Merged-In: I49a8d3cfeb45eddc95ad6ab4a33b0adf0585cde2
2 files changed