net: atlantic: make symbol 'aq_pm_ops' static

Fix sparse warnings:

drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c:426:25: warning: symbol 'aq_pm_ops' was not declared. Should it be static?
Reported-by: NHulk Robot <hulkci@huawei.com>
Fixes: 8aaa112a ("net: atlantic: refactoring pm logic")
Signed-off-by: Nzhengbin <zhengbin13@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c

@@ -423,7 +423,7 @@ static int aq_pm_resume_restore(struct device *dev)
 	return atl_resume_common(dev, true);
 }
 
-const struct dev_pm_ops aq_pm_ops = {
+static const struct dev_pm_ops aq_pm_ops = {
 	.suspend = aq_pm_suspend_poweroff,
 	.poweroff = aq_pm_suspend_poweroff,
 	.freeze = aq_pm_freeze,