Merge tag 'gvt-next-fixes-2021-04-21' of https://github.com/intel/gvt-linux into drm-intel-next-fixes

gvt-next-fixes-2021-04-21

- Remove one unused function warning (Jiapeng)
- Fix intel_gvt_init_device() return type (Dan)
- Remove one duplicated register accessible check (Zhenyu)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
From: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210421094522.GU1551@zhen-hp.sh.intel.com