irqchip: tegra: Add Tegra210 support

Tegra210 uses the same legacy interrupt controller as older generations
but it adds a sixth instance.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lkml.kernel.org/r/1427106379-14037-1-git-send-email-thierry.reding@gmail.com


Signed-off-by: Jason Cooper <jason@lakedaemon.net>