Promote HWASan tests to presubmit.

They have been passing and do not show significant slowdown.

Change-Id: I3eba6ecb746160d75e9a2c9561bceb71a09117d3
diff --git a/init/TEST_MAPPING b/init/TEST_MAPPING
index fa1627c..36ca379 100644
--- a/init/TEST_MAPPING
+++ b/init/TEST_MAPPING
@@ -10,7 +10,7 @@
       "name": "MicrodroidHostTestCases"
     }
   ],
-  "hwasan-postsubmit": [
+  "hwasan-presubmit": [
     {
       "name": "CtsInitTestCases"
     },