MIPS ioremap cleanups v2

[Thomas Bogendoerfer]

On Thu, Apr 16, 2020 at 05:00:04PM +0200, Christoph Hellwig wrote:
> Hi Thomas,
> 
> below is a bunch of cleanups for the MIPS ioremap code.  Compile tested
> only.
> 
> Changes since v1:
>  - don't remove cpu_has_64bit_gp_regs
>  - add a new prep patch to stop txx9aclc-ac97 from poking into ioremap
>    internals

series applied to mips-next.

Thomas.

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