drivers: rtc: add RTC API

This API allows to interact with a RTC registered as the system RTC.

Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@l

drivers: rtc: add RTC API

This API allows to interact with a RTC registered as the system RTC.

Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Clément Léger <clement.leger@bootlin.com>

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