dt-bindings: rtc: convert hym8563 bindings to json-schema

Convert RTC binding for Haoyu Microelectronics HYM8563 to Device Tree
Schema format.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221024165549.74574-7-sebastian.reichel@collabora.com


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>