authfs: Delete TEST_MAPPING

TreeHugger seems have trouble building a dependency of shared library.
Until the cause is identified, remove the test from TreeHugger to
unblock the early development.

Test: None
Bug: 173408650
Bug: 171310075
Change-Id: I496edeb5807c8ce24c86d54d8ba7f9a9698dc7cb
diff --git a/authfs/TEST_MAPPING b/authfs/TEST_MAPPING
deleted file mode 100644
index 9e1505d..0000000
--- a/authfs/TEST_MAPPING
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "presubmit": [
-    {
-      "name": "authfs_host_test_src_lib",
-      "host": true
-    }
-  ]
-}