The nvidia,tegra210-ahub binding is missing schema for child nodes. This
results in warnings if 'additionalProperties: false' is set (or when the
tools implement 'unevaluatedProperties' support). Add the child nodes
and reference their schema if one exists.

Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Sameer Pujar <spujar@nvidia.com>
Cc: alsa-devel@alsa-project.org
Cc: linux-tegra@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Acked-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/20210326195003.3756394-1-robh@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>