Add PrintSpoolerOutOfProcessTests module in Post submit test cases

Bug: 335214357
Change-Id: I708c96784aeb9b84b6e864f4a6b8e8d5af6f577c
Test: https://android-build.corp.google.com/test_investigate/?invocationId=I04700010277522102&testResultId=TR45229305614191304&redirect=http://fusion2/8d0fc45d-7861-40ff-ad48-32a89fd79610
diff --git a/packages/PrintSpooler/TEST_MAPPING b/packages/PrintSpooler/TEST_MAPPING
index 4fa8822..ad3b44f 100644
--- a/packages/PrintSpooler/TEST_MAPPING
+++ b/packages/PrintSpooler/TEST_MAPPING
@@ -8,5 +8,10 @@
         }
       ]
     }
+  ],
+  "postsubmit": [
+    {
+      "name": "PrintSpoolerOutOfProcessTests"
+    }
   ]
 }