Add TODO for TODO_XPSHOLD.
Add TODO for TODO_XPSHOLD.

The TODO line was accidentally removed in the last CL.

BUG=None
TEST=None
BRANCH=None
Signed-off-by: Louis Yung-Chieh Lo <2d80bee8408e64f859a1b5868bd3b311c0a4b4cd@chromium.org>

Change-Id: Ia37e0f6bf21e072c714512d2eaa7ad69ef5fad93
Reviewed-on: https://chromium-review.googlesource.com/175632
Reviewed-by: Yung-chieh Lo <2d80bee8408e64f859a1b5868bd3b311c0a4b4cd@chromium.org>
Commit-Queue: Yung-chieh Lo <2d80bee8408e64f859a1b5868bd3b311c0a4b4cd@chromium.org>
Tested-by: Yung-chieh Lo <2d80bee8408e64f859a1b5868bd3b311c0a4b4cd@chromium.org>
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

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