bnx2x: Handling PHY FW load failure

If the default PHY version (0x4321) is read - the PHY FW load failed

Signed-off-by: Yaniv Rosner <yanivr@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>