drm/i915/gvt: Fix Comet Lake

Prior to the commit below the GAMT_CHKN_BIT_REG address was setup for
devices matching (D_KBL | D_CFL), where intel_gvt_get_device_type()
returns D_CFL for either Coffee Lake or Comet Lake.  Include the missed
platform.`

Link: https://lore.kernel.org/all/20220808142711.02d16782.alex.williamson@redhat.com
Fixes: e0f74ed4 ("i915/gvt: Separate the MMIO tracking table from GVT-g")
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/166016852965.780835.10366587502693016900.stgit@omenReviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/intel_gvt_mmio_table.c

@@ -1074,7 +1074,8 @@ static int iterate_skl_plus_mmio(struct intel_gvt_mmio_table_iter *iter)
 	MMIO_D(GEN8_HDC_CHICKEN1);
 	MMIO_D(GEN9_WM_CHICKEN3);
 
-	if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv))
+	if (IS_KABYLAKE(dev_priv) ||
+	    IS_COFFEELAKE(dev_priv) || IS_COMETLAKE(dev_priv))
 		MMIO_D(GAMT_CHKN_BIT_REG);
 	if (!IS_BROXTON(dev_priv))
 		MMIO_D(GEN9_CTX_PREEMPT_REG);