linuxkpi: Add pin_user_pages*() functions
They were defined in the i915 DRM driver. I move the code in linuxkpi so
it can benefit other drivers.
Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38078
linuxkpi: Add `pin_user_pages*()` functions Tags None Referenced Files None Subscribers None
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