dt-bindings: mfd: Convert atmel-flexcom to json-schema

Convert the Atmel flexcom device tree bindings to json schema.

Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Balakrishnan Sambath <balakrishnan.s@microchip.com>
Link: https://lore.kernel.org/r/20240223-b4-sama5d2-flexcom-yaml-v2-2-7e96c60c7701@microchip.com


Signed-off-by: Lee Jones <lee@kernel.org>