rtc: rx8025: Convert to .probe_new()

.probe_new() doesn't get the i2c_device_id * parameter, so determine
that explicitly in .probe().

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20221021130706.178687-10-u.kleine-koenig@pengutronix.de


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