Add the seccomp tests to bionic's TEST_MAPPING presubmit.

There's basically nothing else that notices whether one of the generated filters is correct or not.

Change-Id: Iba34739afb2f68506f9348cfcb9021107e8ee1b8
diff --git a/TEST_MAPPING b/TEST_MAPPING
index e98c2ff..f81d348 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -19,6 +19,9 @@
       "name": "CtsGwpAsanTestCases"
     },
     {
+      "name": "CtsSeccompHostTestCases"
+    },
+    {
       "name": "CtsTaggingHostTestCases"
     },
     {