audio: Add presubmit tests for APM

Hook up audiopolicy_tests and systemaudio_tests as presubmit tests.
These tests are native C++Unit tests, it takes a couple of millisec
to run them.

Bug: 122855449
Test: cd frameworks/av/services/audiopolicy && atest
Change-Id: I7abfeb81472ff2a2610948aa514eb506bed7546b
diff --git a/services/audiopolicy/TEST_MAPPING b/services/audiopolicy/TEST_MAPPING
new file mode 100644
index 0000000..a94fd87
--- /dev/null
+++ b/services/audiopolicy/TEST_MAPPING
@@ -0,0 +1,10 @@
+{
+  "presubmit": [
+    {
+       "name": "audiopolicy_tests"
+    },
+    {
+       "name": "systemaudio_tests"
+    }
+  ]
+}