bus: sunxi-rsb: Convert to devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() to simplify code.

Signed-off-by: Yangtao Li <frank.li@vivo.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20230706072042.31296-1-frank.li@vivo.com


Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>