rtc: jz4740: Use dev_err_probe()

Use dev_err_probe() where it makes sense to simplify a bit the code.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20230129120442.22858-4-paul@crapouillou.net


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