Unmark things const in NewDataWriter

Operator move doesn't let us actually move things when they are const.
Apparently our compilers do this wrong or something?

Change-Id: I1a0b95c1812032b51eaa3d0c3391a31940482270
Signed-off-by: Austin Schuh <austin.schuh@bluerivertech.com>
diff --git a/aos/events/logging/log_namer.h b/aos/events/logging/log_namer.h
index f1f1829..00e1856 100644
--- a/aos/events/logging/log_namer.h
+++ b/aos/events/logging/log_namer.h
@@ -106,8 +106,8 @@
 
   monotonic_clock::time_point monotonic_start_time_ = monotonic_clock::min_time;
 
-  const Node *const node_ = nullptr;
-  const size_t node_index_ = 0;
+  const Node *node_ = nullptr;
+  size_t node_index_ = 0;
   LogNamer *log_namer_;
   UUID parts_uuid_ = UUID::Random();
   size_t parts_index_ = 0;