net: hns: use IRQ_NOAUTOEN to avoid irq is enabled due to request_irq

Rather than doing request_irq and then disabling the irq immediately, it
should be safer to use IRQ_NOAUTOEN flag for the irq. It removes any gap
between request_irq() and disable_irq().

Cc: Salil Mehta <salil.mehta@huawei.com>
Reviewed-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>