rtc: jz4740: drop unused module alias

The driver only support OF probe so drop the unused platform module
alias.

Fixes: 24e1f2c9 ("rtc: ingenic: Only support probing from devicetree")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Acked-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20250423130318.31244-5-johan+linaro@kernel.org


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