Merge tag 'gvt-next-2018-05-14' of https://github.com/intel/gvt-linux into drm-intel...

- Improve the emulation of virtual non-priv register. (Yan)
- Reverse the hack of host of preeption of GVT-g. (Weinan)
- Improve untracked warning message.(Changbin)

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ebae7cf1-6550-bb44-74a2-d3a014051804@intel.com