Add android.virtualdevice.cts.VirtualAudioTest to postsubmit

These tests exercise audio playback and capture on CF and are
useful in spotting issues in the audio pipeline end-to-end.

Bug: 316017930
Test: atest CtsVirtualDevicesTestCases
Change-Id: If625cec5bc2d281f1e0d99b820f604f1bac7b621

audio/aidl/TEST_MAPPING

@@ -70,6 +70,14 @@
     },
     {
       "name": "audiosystem_tests"
+    },
+    {
+      "name": "CtsVirtualDevicesTestCases",
+      "options" : [
+        {
+          "include-filter": "android.virtualdevice.cts.VirtualAudioTest"
+        }
+      ]
     }
   ]
 }