Fix Sparse warnings

[Hardevsinh Palaniya]

Hi Marc,

>> in patch 2/2:
>>        - Use ioread32be instead of readl
>>        - Use iowrite32be instead of writel
>>
>> Note: Drop 2 patches(patch 2/4 & 4/4) from the last version
>> link to v1: https://lore.kernel.org/linux-spi/20240927132944.19285-1-hardevsinh.palaniya@siliconsignals.io/T/#t
>
>Have you checked the code on real hardware or compared the generated
>code on the asm level?

it's just resolve casting warnings so....

No, I haven’t tested the code on real hardware.

Are there alternative methods to verify it without using hardware?

Best Regards,
Hardev