drm/i915/guc: Convert golden context prep to iosys_map

Use the saved ads_map to prepare the golden context. One difference from
the init context is that this function can be called before there is a
gem object (and thus the guc->ads_map) to calculare the size of the
golden context that should be allocated for that object.

So in this case the function needs to be prepared for not having the
system_info with enabled engines filled out. To accomplish that an
info_map is prepared on the side to point either to the gem object
or the local variable on the stack. This allows making
fill_engine_enable_masks() operate always with a iosys_map
argument.

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: Matthew Brost <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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