[PATCH] spi: aspeed: Use devm_iounmap() to unmap devm_ioremap() memory

[Markus Elfring]

> How about change the description to the below one?
> 
> Use devm_iounmap() to unmap memory mapped with devm_ioremap().
> This ensures proper cleanup of device-managed resources.

  Thus ensure?

Regards,
Markus