net/hns3: move speed auto-negotiation warning

net/hns3: move speed auto-negotiation warning

PF driver prints a warning on device that does not support auto-negotiation
when user does not configure "link_speeds" (default 0), which means
auto-negotiation. Currently, this warning information is printed in
dev_configure stage and a success is returned. Perhaps the user may call
dev_configure multiple times before dev_start for some reason or purpose.
In this case, this message may be printed multiple times. So this patch
moves it to dev_start stage.

Fixes: cfc9fe48c4d4 ("net/hns3: move link speeds check to configure")
Cc: stable@dpdk.org
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>