atlantic: Fix driver resume flow.

Driver crashes when restoring from the Hibernate. In the resume flow,
driver need to clean up the older nic/vec objects and re-initialize them.

Fixes: 8aaa112a ("net: atlantic: refactoring pm logic")
Signed-off-by: Sudarsana Reddy Kalluru <skalluru@marvell.com>
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>