drm/i915/gvt: Fix cmd parser error for Passmark9

This is to add one new register required for windows guest driver
update when running Passmark9, otherwise cmd parser would complain
and fail guest workload.

Cc: Terrence Xu <terrence.xu@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20211011043329.3519093-1-zhenyuw@linux.intel.com


Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>