cros_bundle_firmware: Remove old fdtput comment

Now that fdtput supports automatic node creation, we can remove this
old comment.

BUG=chromium-os:32437
TEST=none

Change-Id: Ib21fe618539797fa10005f70903b8b283b865a80
Reviewed-on: https://gerrit.chromium.org/gerrit/28175
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Ready: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/host/lib/pack_firmware.py b/host/lib/pack_firmware.py
index d80de0e..3da9ae1 100644
--- a/host/lib/pack_firmware.py
+++ b/host/lib/pack_firmware.py
@@ -753,9 +753,6 @@
     we perform two passes of the algorithm. On the second pass we will
     be writing data that is already there, so the fdt size will not
     change.
-
-    TODO(sjg@chromium.org): Since we cannot add whole subnodes
-    due to a limitation of fdtput, these must exist already.
     """
     for pass_num in range(0,2):
       for entry in self.entries: