Clean up rust_test_host TEST_MAPPING after default update am: 08d4c14707 am: 2f7ebb6c03 am: 6c4596cd88 am: ac9e0fa1a7

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/thread_local/+/1590411

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I3210486df22802d6602611c8a8cb380b9a01da32
diff --git a/TEST_MAPPING b/TEST_MAPPING
deleted file mode 100644
index 9e7c1a6..0000000
--- a/TEST_MAPPING
+++ /dev/null
@@ -1,9 +0,0 @@
-// Generated by cargo2android.py for tests in Android.bp
-{
-  "presubmit": [
-    {
-      "host": true,
-      "name": "thread_local_host_test_src_lib"
-    }
-  ]
-}