hinic: optmize rx refill buffer mechanism

There is no need to schedule a different tasklet for refill,
This patch remove it.

Suggested-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: Xue Chaojing <xuechaojing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>