rtc: rx8025: set range

Set the RTC range, it is a classic BCD RTC, with 00 being a leap
year. Let the core handle range checking.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211107225458.111068-9-alexandre.belloni@bootlin.com