Promote HWASan tests to presubmit.

They have been passing and do not show significant slowdown.

Change-Id: I2f6a81dac60594673085d7bd6958f6e02da5b745
diff --git a/tests/TEST_MAPPING b/tests/TEST_MAPPING
index 5bdb1d3..fe05283 100644
--- a/tests/TEST_MAPPING
+++ b/tests/TEST_MAPPING
@@ -4,7 +4,7 @@
       "name": "dmabufheap-unit-tests"
     }
   ],
-  "hwasan-postsubmit": [
+  "hwasan-presubmit": [
     {
       "name": "dmabufheap-unit-tests"
     }