Move Mockito/Dexmaker tests to postsubmit.

Bug: 136219255
Test: TreeHugger.
Change-Id: Ic7339095adb350f50389434e7cf5daa335c65f81

TEST_MAPPING

diff --git a/TEST_MAPPING b/TEST_MAPPING
index a4c5bba..cd6767e 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,5 +1,5 @@
 {
-    "presubmit": [
+    "postsubmit": [
         {
             "name": "CtsMockingTestCases"
         },
@@ -13,4 +13,4 @@
             "name": "CtsExtendedMockingTestCases"
         }
     ]
-}
\ No newline at end of file
+}