init: add unit tests for tokenizer.cpp

Test: this unit test
Change-Id: Iae24f3bf7850dd4b298281f6608bce195096d60a
diff --git a/init/Android.bp b/init/Android.bp
index cf7637f..625fb94 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -179,6 +179,7 @@
         "rlimit_parser_test.cpp",
         "service_test.cpp",
         "subcontext_test.cpp",
+        "tokenizer_test.cpp",
         "ueventd_test.cpp",
         "util_test.cpp",
     ],