Swich TEST_MAPPING config to unit_tests:true

All unit_tests:true are run in presubmit which avoids
the explicit definition of TEST_MAPPING.

Test: presubmit runs all those tests
Bug: 175408655
Change-Id: Ibfad3fe2dd8d2fa1ebc6f6bcbd8ab34c2a0069dc

tools/releasetools/Android.bp

@@ -566,7 +566,9 @@ python_test_host {
             embedded_launcher: false,
         },
     },
-    test_suites: ["general-tests"],
+    test_options: {
+        unit_test: true,
+    },
 }
 
 python_test_host {
@@ -583,5 +585,7 @@ python_test_host {
             embedded_launcher: false,
         },
     },
-    test_suites: ["general-tests"],
+    test_options: {
+        unit_test: true,
+    },
 }

tools/releasetools/TEST_MAPPING

@@ -1,12 +0,0 @@
-{
-  "presubmit": [
-    {
-      "name": "releasetools_test",
-      "host": true
-    },
-    {
-      "name": "releasetools_py3_test",
-      "host": true
-    }
-  ]
-}