dt-bindings: pinctrl: Convert i.MX7D to json-schema

Convert the i.MX7D pinctrl binding to DT schema format using json-schema

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20220303150653.1903910-1-alexander.stein@ew.tq-group.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>