arm64: tegra: Audio graph sound card for Jetson AGX Xavier

Enable support for audio-graph based sound card on Jetson AGX Xavier.
Following I/O interfaces are enabled.
  * I2S1, I2S2, I2S4 and I2S6
  * DMIC3

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