e1000e: fix link state on resume

e1000e: fix link state on resume

On resume e1000e_vm_state_change() always calls e1000e_autoneg_resume()
that sets link_down to false, and thus activates the link even
if we have disabled it.

The problem can be reproduced starting qemu in paused state (-S) and
then set the link to down. When we resume the machine the link appears
to be up.

Reproducer:

   # qemu-system-x86_64 ... -device e1000e,netdev=netdev0,id=net0 -S

   {"execute": "qmp_capabilities" }
   {"execute": "set_link", "arguments": {"name": "net0", "up": false}}
   {"execute": "cont" }

To fix the problem, merge the content of e1000e_vm_state_change()
into e1000e_core_post_load() as e1000 does.

Buglink: https://issues.redhat.com/browse/RHEL-21867
Fixes: 6f3fbe4ed06a ("net: Introduce e1000e device emulation")
Suggested-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>