mtd: rawnand: ingenic: Use devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() instead of platform_get_resource()
+ devm_ioremap_resource().

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200211173151.27587-1-paul@crapouillou.net