qed: Make ll2_cbs static

Fix the following sparse warning:

drivers/net/ethernet/qlogic/qed/qed_ll2.c:2334:20: warning: symbol 'll2_cbs'
was not declared. Should it be static?
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NZou Wei <zou_wei@huawei.com>
Acked-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qed/qed_ll2.c

@@ -2331,7 +2331,7 @@ static void qed_ll2_register_cb_ops(struct qed_dev *cdev,
 	cdev->ll2->cb_cookie = cookie;
 }
 
-struct qed_ll2_cbs ll2_cbs = {
+static struct qed_ll2_cbs ll2_cbs = {
 	.rx_comp_cb = &qed_ll2b_complete_rx_packet,
 	.rx_release_cb = &qed_ll2b_release_rx_packet,
 	.tx_comp_cb = &qed_ll2b_complete_tx_packet,