TEST_MAPPING: enable Ravenwood in postsubmit

Ravenwood is already running in presubmit elsewhere.
Enabling it in postsubmit here on omakoto@'s advice.

Bug: 292141694
Test: visual confirmation of `git diff`
Change-Id: I4d4aae5497a1cb31a6a9b098518aae6d9a9c2702
Signed-off-by: Lucas Henneman <henneman@google.com>
diff --git a/TEST_MAPPING b/TEST_MAPPING
index d59775f..ecfd86c 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -138,15 +138,14 @@
     }
   ],
   "postsubmit-ravenwood": [
-    // TODO(ravenwood) promote it to presubmit
-    // TODO: Enable it once the infra knows how to run it.
-//    {
-//      "name": "CtsUtilTestCasesRavenwood",
-//      "file_patterns": [
-//        "*Ravenwood*",
-//        "*ravenwood*"
-//      ]
-//    }
+    {
+      "name": "CtsUtilTestCasesRavenwood",
+      "host": true,
+      "file_patterns": [
+        "*Ravenwood*",
+        "*ravenwood*"
+      ]
+    }
   ],
   "postsubmit-managedprofile-stress": [
     {