dt-bindings: memory: tegra20: mc: Convert to schema

Convert Tegra20 Memory Controller binding to schema.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210330230445.26619-5-digetx@gmail.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>