Clean up rust_test_host TEST_MAPPING after default update am: 3d62e3b986

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/tinyvec_macros/+/1584444

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I41be181846135f9a1870b150405cb659b5fab4e7
diff --git a/TEST_MAPPING b/TEST_MAPPING
index a3393d8..710401c 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -2,10 +2,6 @@
 {
   "presubmit": [
     {
-      "host": true,
-      "name": "tinyvec_macros_host_test_src_lib"
-    },
-    {
       "name": "tinyvec_macros_device_test_src_lib"
     }
   ]