Tegra210 QSPI clock output has divider DIV2_SEL which will be enabled
when using DDR interface mode.

This patch adds clock ID for this to dt-binding.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>