Convert the m41t80 text schema to YAML schema.

Add "#clock-cells" requirement, which is required by clock-output-names.
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221211205124.23823-1-marex@denx.deSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>