drm/xe: Introduce const cast helper

Typically we want to preserve pointer constness when converting
from one xe pointer to another, but in some rare cases, like kunit
parameter conversions, we might want to discard this constness.
Add a helper that we will use to clearly indicate our intention.

Signed-off-by: Michal Wajdeczko <[email protected]>
Reviewed-by: Jonathan Cavitt <[email protected]> #v1
Cc: Lucas De Marchi <[email protected]>
Reviewed-by: Lucas De Marchi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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