drm/i915/guc: add a helper to allocate and map guc vma

We already have a couple of use-cases in the code and another one will
come in one of the later patches in the series.

v2: use the new function for the CT object as well

Signed-off-by: Daniele Ceraolo Spurio <[email protected]>
Cc: Michal Wajdeczko <[email protected]>
Cc: John Harrison <[email protected]>
Cc: Matthew Brost <[email protected]>
Reviewed-by: Chris Wilson <[email protected]> #v1
Reviewed-by: John Harrison <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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