Remove odsign_e2e_tests from TEST_MAPPING.

The test is failing in TEST_MAPPING because it takes long to run. We are now running the test as a post submit on git_master. https://android-build.googleplex.com/builds/tests/view?invocationId=I11500009977015563&testResultId=TR12027712961168391

Bug: 193616266
Change-Id: Iaa4c697262a164c193b9176f74c242d6d538b418
Test: Presubmits
diff --git a/ondevice-signing/TEST_MAPPING b/ondevice-signing/TEST_MAPPING
deleted file mode 100644
index 03b9b95..0000000
--- a/ondevice-signing/TEST_MAPPING
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "presubmit": [
-    {
-      "name": "odsign_e2e_tests"
-    }
-  ]
-}