arm64: tegra: Add Tegra234 GPCDMA device tree node

Add device tree nodes for Tegra234 GPCDMA

Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>