dt-bindings: rtc: microcrystal,rv3028: add #clock-cells property

dt-bindings: rtc: microcrystal,rv3028: add #clock-cells property

RV3028 RTC has a clock out features, the clk out can be
controlled using clkout register, to consume the clock out
from rv3028 '#clock-cells' property is added.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Karthikeyan Krishnasamy <karthikeyan@linumiz.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20240912142451.2952633-4-karthikeyan@linumiz.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>