Add `libnativeloader_test` to ART's `TEST_MAPPING` and ART MTS.

In ART MTS, add this test module to shard 00 (along with other ART
gtests).

Output of `art/test/utils/regen-test-files`:

  $ art/test/utils/regen-test-files
  Generated Blueprint files for 657 ART run-tests out of 950 (69%).
  Generated TEST_MAPPING entries for 404 ART run-tests out of 950 (42%):
    404 ART run-tests (100%) in `mainline-presubmit` test group.
     19 ART gtests (95%) in `mainline-presubmit` test group.
    404 ART run-tests (100%) in `presubmit` test group.
     20 ART gtests (100%) in `presubmit` test group.

Test: atest --test-mapping art:presubmit
Test: m mts && mts-tradefed run commandAndExit mts-art
Test: m mts && mts-tradefed run commandAndExit mts-art-shard-00
Test: m mts \
        && mts-tradefed run commandAndExit mts-art \
             --module libnativeloader_test
Bug: 143943489
Bug: 167385698
Change-Id: I771f97c0a3a537d16082eb5f873b55edcf4e5299
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 3dfc66a..c5f1627 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1269,6 +1269,9 @@
     },
     {
       "name": "art_standalone_sigchain_tests[com.google.android.art.apex]"
+    },
+    {
+      "name": "libnativeloader_test[com.google.android.art.apex]"
     }
   ],
   "presubmit": [
@@ -2555,6 +2558,9 @@
     },
     {
       "name": "art_standalone_sigchain_tests"
+    },
+    {
+      "name": "libnativeloader_test"
     }
   ]
 }
diff --git a/libnativeloader/Android.bp b/libnativeloader/Android.bp
index 314e92e..e14aea2 100644
--- a/libnativeloader/Android.bp
+++ b/libnativeloader/Android.bp
@@ -180,7 +180,10 @@
     // Added to CTS for API coverage of libnativeloader which is backed by the
     // ART module.
     test_config_template: ":art-gtests-target-standalone-cts-template",
-    test_suites: ["cts"],
+    test_suites: [
+        "cts",
+        "mts-art",
+    ],
 }
 
 art_cc_test {
diff --git a/test/utils/regen-test-files b/test/utils/regen-test-files
index 4e19fc9..4ab13d0 100755
--- a/test/utils/regen-test-files
+++ b/test/utils/regen-test-files
@@ -224,6 +224,7 @@
     "art_standalone_runtime_compiler_tests",
     "art_standalone_runtime_tests",
     "art_standalone_sigchain_tests",
+    "libnativeloader_test",
 ]
 
 # ART gtests that need root access to the device.