s2io: add PCI error recovery support

This patch adds PCI error recovery support to the
s2io 10-Gigabit ethernet device driver. Third revision,
blocks interrupts and the watchdog.

Tested, seems to work well.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Acked-by: Ramkrishna Vepa <Ramkrishna.Vepa@neterion.com>
Cc: Raghavendra Koushik <raghavendra.koushik@neterion.com>
Cc: Wen Xiong <wenxiong@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>