Promote HWASan tests to presubmit.

They have been passing and do not show significant slowdown.

Change-Id: I64328118f0606c1b62a793fb8913eed5e5ba9578
diff --git a/libpackagelistparser/TEST_MAPPING b/libpackagelistparser/TEST_MAPPING
index d69a7fb..f4a7761 100644
--- a/libpackagelistparser/TEST_MAPPING
+++ b/libpackagelistparser/TEST_MAPPING
@@ -4,7 +4,7 @@
       "name": "libpackagelistparser_test"
     }
   ],
-  "hwasan-postsubmit": [
+  "hwasan-presubmit": [
     {
       "name": "libpackagelistparser_test"
     }