Add compatibility wrapper

This implements the Keymint 1 spec by wrapping the legacy Keymaster
implementation.

Test: atest keystore2_km_compat_test
Test: atest keystore2_certificate_test
Test: Manually verify that keystore2 can find a legacy implementation.
Change-Id: Ia56c25eed0f97a7e6194954a655ceb62259b3273
diff --git a/keystore2/TEST_MAPPING b/keystore2/TEST_MAPPING
index 70e3175..33d157e 100644
--- a/keystore2/TEST_MAPPING
+++ b/keystore2/TEST_MAPPING
@@ -1,6 +1,12 @@
 {
   "presubmit": [
     {
+      "name": "keystore2_certificate_test"
+    },
+    {
+      "name": "keystore2_km_compat_test"
+    },
+    {
       "name": "keystore2_test"
     }
   ]