hinic: make a bunch of functions static

These fucntions is used only in hinic_sriov.c,
so make them static to fix sparse warnings.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>