[PATCH 00/19] drm/i915/guc: Refactor ADS access to use iosys_map

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2nd version of https://patchwork.freedesktop.org/series/99378/

As first patch I'm including the dma-buf-map rename to iosys-map for
completeness and to allow the other patches to be reviewed. However the
first patch was also sent by itself.

I think all the feedback from v1 was incorporated in this version. All
the new helpers in iosys-map were squashed in a single patch as
requested.

Original cover letter:

While porting i915 to arm64 we noticed some issues accessing lmem.
Some writes were getting corrupted and the final state of the buffer
didn't have exactly what we wrote. This became evident when enabling
GuC submission: depending on the number of engines the ADS struct was
being corrupted and GuC would reject it, refusin to initialize.


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