Renamed hte dt binding directory to timestamp according review comment.
Addressed minor comment about having HTE acronym first in the common dt
binding document.

The change reflects above renaming in MAINTAINERS files too.
Signed-off-by: NDipen Patel <dipenp@nvidia.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NThierry Reding <treding@nvidia.com>