dt-bindings: tegra: Allow #{address,size}-cells = <2>

Both 1 and 2 are valid values for #address-cells and #size-cells on the
various busses specified in these bindings, so explicitly allow 2.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>