bnx2x: Don't prevent RSS configuration in INT#x and MSI interrupt modes.

Don't prevent RSS configuration in INT#x and MSI interrupt modes. Otherwise
Rx hash key won't be available.

Signed-off-by: Vladislav Zolotarov <vladz@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>