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>