Add CtsMediaProviderTranscodeTests to presubmit

Also remove MediaProviderTranscodeTests mapping since they are exactly
the same and we need only of them to run.
We'll remove the MediaProviderTranscodeTests themselves in a seaparate
cl.

BUG: 169546642
Test: presubmit
Change-Id: Ib06e4bf08c6b755927fc715f600e1dd32c497302
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 2994320..64830a3 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -40,7 +40,7 @@
             "name": "fuse_node_test"
         },
         {
-            "name": "MediaProviderTranscodeTests"
+            "name": "CtsMediaProviderTranscodeTests"
         }
     ],
     "postsubmit": [