Revert^2 "Enable mainline-presubmit for derive_sdk"

This reverts commit 944b18abcdcd9a73e23a8bfe9e5f3a1cbb76f7b4.

Reason for revert: rollforward

Change-Id: Iaacdacf68968eddcc72c215a96e3b722c9215c5a
diff --git a/TEST_MAPPING b/TEST_MAPPING
index da9469c..18355d5 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,4 +1,9 @@
 {
+  "mainline-presubmit": [
+    {
+      "name": "derive_sdk_test[com.google.android.sdkext.apex]"
+    }
+  ],
   "presubmit": [
     {
       "name": "CtsSdkExtensionsTestCases"