rtc: goldfish: Use gf_ioread32()/gf_iowrite32()

Replace readl()/writel() by gf_ioread32()/gf_iowrite32()
as done for goldfish-tty.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220406201523.243733-3-laurent@vivier.eu


Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>