bnx2x: Add PCIE EEH support

Add PCI recovery functions to the driver.  The initial PCI state is
also saved so the MSI state can be restored during PCI recovery.

Signed-off-by: Wendy Xiong <wendyx@us.ibm.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>