Keep CarrierAppIntegrationTestCases in internal cf.

Bug: 302382476
Change-Id: I082dbca3579ec0b164366bbbe6791a4fb3f3f758
Test: presubmit
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 55f1ccc..59685b1 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -9,7 +9,8 @@
       ]
     },
     {
-      "name": "CarrierAppIntegrationTestCases"
+      "name": "CarrierAppIntegrationTestCases",
+      "keywords": ["internal"]
     },
     {
       "name": "CtsTelephony2TestCases",