Add CtsOsTestCases:android.os.cts.HwBinderTest to postsubmits

This recently failed after a change to HIDL service management.
Will promote to presubmits when the SLO checker is happy.

Test: atest CtsOsTestCases:android.os.cts.HwBinderTest
Bug: 332395670
Change-Id: Ie83058149a2cfb939faa51bc122b8900fd010e7e
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 4e330d8..a9ce2a2 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -24,5 +24,15 @@
     {
       "name": "hidl_test"
     }
+  ],
+  "postsubmit": [
+    {
+       "name": "CtsOsTestCases",
+       "options": [
+           {
+              "include-filter": "android.os.cts.HwBinderTest"
+           }
+       ]
+    }
   ]
 }