netdev: make pci_error_handlers const

drivers/net/ethernet/atheros/atl1c/atl1c_main.c

drivers/net/ethernet/atheros/atl1e/atl1e_main.c

drivers/net/ethernet/broadcom/bnx2.c

drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c

drivers/net/ethernet/broadcom/tg3.c

drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

drivers/net/ethernet/emulex/benet/be_main.c

drivers/net/ethernet/intel/e100.c

drivers/net/ethernet/intel/e1000/e1000_main.c

drivers/net/ethernet/intel/e1000e/netdev.c

drivers/net/ethernet/intel/igb/igb_main.c

drivers/net/ethernet/intel/igbvf/netdev.c

drivers/net/ethernet/intel/ixgb/ixgb_main.c

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c

drivers/net/ethernet/mellanox/mlx4/main.c

drivers/net/ethernet/neterion/s2io.c

drivers/net/ethernet/neterion/vxge/vxge-main.c

drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c