dt-bindings: gpio: Add Tegra241 support

Add the port definitions for the main and AON GPIO controllers found on
Tegra241 (Grace).

Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>