arm64: tegra: Rename ADMA device nodes for Tegra210

DMA device nodes should follow regex pattern of "^dma-controller(@.*)?$".
This is a preparatory patch to use YAML doc format for ADMA.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>