[PATCH] drm/virtio: new ioctl for pinning and lazy pinning

First patch implements new ioctl. If there are no pages pinned 
to bo object, then pin it.

Second patch implements concepts of lazy pin. Userspace
must opt-in for not pinning pages.

I would like to record this work here and investigate another
possibility.

Mainly, problem statement for this two patches is to reduce memory 
usage consumed by Guest. If we can avoid pinning pages for such
resources like textures, then we can use staging buffer to upload
texture data to host. 


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