Add CONFIG_CFQ_GROUP_IOSCHED check

blkio.weight depends on this config.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>

contrib/check-config.sh

@@ -223,7 +223,7 @@ else
 fi
 
 flags=(
-	BLK_CGROUP IOSCHED_CFQ BLK_DEV_THROTTLING
+	BLK_CGROUP BLK_DEV_THROTTLING IOSCHED_CFQ CFQ_GROUP_IOSCHED
 	CGROUP_PERF
 	CGROUP_HUGETLB
 	NET_CLS_CGROUP $netprio