dt-bindings: i2c: tegra-bpmp: Convert to json-schema

Convert the NVIDIA Tegra186 (and later) BPMP I2C bindings from the
free-form text format to json-schema.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20211208143306.534700-1-thierry.reding@gmail.com


Signed-off-by: Rob Herring <robh@kernel.org>