Cleanup some trivial TODOs.

1) There's no reason or way to support boot_clock for waiting for
   property changes, since the underlying futex_wait uses
   CLOCK_MONOTONIC.  We probably wouldn't want boot_clock even if it
   did, since it doesn't make sense to consider the time a device was
   suspending in the timeout for waiting for a property to change.
2) The init tokenizer has been essentially unchanged for a decade,
   there's no motivation to 'fix' it to not require a trailing
   newline.
3) The ueventd TODO regarding moving vendor specific ueventd.rc
   entries out of rootdir has been fixed.

Test: n/a
Change-Id: I3b68e3d2f25cbd539f9f8ff526669b8af04d833d
diff --git a/init/tokenizer_test.cpp b/init/tokenizer_test.cpp
index 6b31683..0122884 100644
--- a/init/tokenizer_test.cpp
+++ b/init/tokenizer_test.cpp
@@ -28,7 +28,7 @@
 
 void RunTest(const std::string& data, const std::vector<std::vector<std::string>>& expected_tokens) {
     auto data_copy = std::string{data};
-    data_copy.push_back('\n');  // TODO: fix tokenizer
+    data_copy.push_back('\n');
     data_copy.push_back('\0');
 
     parse_state state;