net: hns3: fix kernel crash when devlink reload during vf initialization

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8MWM5


CVE: NA

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The devlink reload process will access the hardware resources,
but the register operation is before the hardware initialize
done, so, if process the devlink reload during initializetion,
may lead the kernel crash. This patch check whether the NIC is
initialized to fix the problem.

Fixes: c3141771 ("net: hns3: add support for registering devlink for VF")
Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>