dt-bindings: spi: Convert Tegra114 SPI to json-schema

Convert the Tegra114 SPI controller device tree bindings from plain text
to json-schema format.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230705152603.2514235-3-thierry.reding@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>