drm/virtio: Replace instances of reference/unreference with get/put

Status from this message: Applied to drm-misc-next, thanks.

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#	Subject and files	Size	Replies	Applied
1/1	drm/virtio: Replace instances of reference/unreference with get/put`drivers/gpu/drm/virtio/virtgpu_display.c` `drivers/gpu/drm/virtio/virtgpu_gem.c` `drivers/gpu/drm/virtio/virtgpu_ioctl.c`	+10 ~~-10~~	2 replies

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