identity: add TEST_MAPPING file to run identity CTS in presubmit.

Bug: None
Test: N/A
Change-Id: I97399c492fca2d3602792b149246e9e817179810
diff --git a/identity/TEST_MAPPING b/identity/TEST_MAPPING
new file mode 100644
index 0000000..87707a8
--- /dev/null
+++ b/identity/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "presubmit": [
+    {
+      "name": "CtsIdentityTestCases"
+    }
+  ]
+}