Audio V4: Require audio V4 in new devices, optional for upgrades

Upgrading devices are allowed to stay on audio V2,
but can also update to V4.

Bug: 38184704
Test: compile and check V4 can be loaded and functional with lshal
Change-Id: Ib1c8381925837a8402ae535755a0558afcf26f4d
Signed-off-by: Kevin Rocard <krocard@google.com>
diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index 464b4a3..930c763 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -2,6 +2,7 @@
     <hal format="hidl" optional="false">
         <name>android.hardware.audio</name>
         <version>2.0</version>
+        <version>4.0</version>
         <interface>
             <name>IDevicesFactory</name>
             <instance>default</instance>
@@ -10,6 +11,7 @@
     <hal format="hidl" optional="false">
         <name>android.hardware.audio.effect</name>
         <version>2.0</version>
+        <version>4.0</version>
         <interface>
             <name>IEffectsFactory</name>
             <instance>default</instance>