drm/i915/gvt: Turn on KBL platform support.

Turn on KBL WS platform support in gvt-g. More platforms would be
enabled, after validate.
Signed-off-by: Xu Han <xu.han@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/intel_gvt.c

@@ -45,6 +45,8 @@ static bool is_supported_device(struct drm_i915_private *dev_priv)
 		return true;
 	if (IS_SKYLAKE(dev_priv))
 		return true;
+	if (IS_KABYLAKE(dev_priv) && INTEL_DEVID(dev_priv) == 0x591D)
+		return true;
 	return false;
 }