net/mlx4_core: Preserve pci_dev_data after __mlx4_remove_one()

[ Upstream commit befdf8978accecac2e0739e6b5075afc62db37fe ]

This patch wrap up a helper function __mlx4_remove_one() which does the tear
down function but preserve the drv_data. Functions like
mlx4_pci_err_detected() and mlx4_restart_one() will call this one with out
releasing drvdata.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --cc drivers/net/ethernet/mellanox/mlx4/main.c
Simple merge

diff --cc drivers/net/ethernet/mellanox/mlx4/mlx4.h
Simple merge