gvt-fixes-2022-01-13

- Make DRM_I915_GVT depend on X86 (Siva Mullati)
- Clean kernel doc in gtt.c (Randy Dunlap)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
From: Zhi Wang <zhi.wang.linux@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1f619581-e3da-3899-09ac-f714d954a580@gmail.com