rtc: m48t59: use platform_get_irq_optional
The IRQ is optional, avoid the error message by using
platform_get_irq_optional.
Signed-off-by: 
Alexandre Belloni <alexandre.belloni@bootlin.com>
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The IRQ is optional, avoid the error message by using
platform_get_irq_optional.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>