drm/i915/gvt: reduce include of vfio.h
Nothing in dmabuf.h needs vfio.h. Replace with actually needed minimal
includes.
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/fbfca6252798ab58717486d1592fed310f880d42.1767180318.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>