gpio: tegra186: Add support for Tegra264

gpio: tegra186: Add support for Tegra264

Extend the existing Tegra186 GPIO controller driver with support for the
GPIO controller found on Tegra264.

Use the "wakeup-parent" phandle from the GPIO device tree node to
ensure the GPIO driver associates with the intended PMC device.
Relying only on compatible-based lookup can select an unexpected
PMC node, so fall back to compatible-based lookup when the phandle
is not present.

Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://patch.msgid.link/20260128085114.1137725-2-pshete@nvidia.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>