drm/i915/guc: Convert policies update to iosys_map

Use iosys_map to write the policies update so access to IO and system
memory is abstracted away.

Cc: Matt Roper <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: John Harrison <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>
Reviewed-by: Matt Atwood <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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