This patch adds poll support to the b44 driver to allow netconsole 
support. Style lifted straight from 8139too.c

here is the dmesg output with it in place:

netconsole: device eth0 not up yet, forcing it
netconsole: carrier detect appears flaky, waiting 10 seconds
b44: eth0: Link is down.
b44: eth0: Link is up at 100 Mbps, full duplex.
b44: eth0: Flow control is on for TX and on for RX.
netconsole: network logging started

output confirmed by netcat on other system.

Signed-off-by: Con Kolivas <kernel@kolivas.org>