Clean up cc_test TEST_MAPPING after default update

After b/179092189, cc_test host_supported:true doesn't need TEST_MAPPING config anymore to
run in presubmit.

Change-Id: I0a15f1af5457a7bf176a92e5381ec8663dd8de56
Test: presubmit
Bug: 178646865
diff --git a/libs/binder/TEST_MAPPING b/libs/binder/TEST_MAPPING
index 2e90142..1fbaa13 100644
--- a/libs/binder/TEST_MAPPING
+++ b/libs/binder/TEST_MAPPING
@@ -22,10 +22,6 @@
       "name": "binderParcelTest"
     },
     {
-      "name": "binderParcelTest",
-      "host": true
-    },
-    {
       "name": "binderLibTest"
     },
     {