netxen: clean up firmware version checks

NX2031 firmware version will never be > 4.0.0, so replace
(adapter->fw_major < 4) checks with pci revision ID check.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/netxen/netxen_nic.h
Simple merge

diff --cc drivers/net/netxen/netxen_nic_ctx.c
Simple merge

diff --cc drivers/net/netxen/netxen_nic_hw.c
Simple merge

diff --cc drivers/net/netxen/netxen_nic_init.c
Simple merge

diff --cc drivers/net/netxen/netxen_nic_main.c
Simple merge