bnx2x: MDC/MDIO CL45 IOCTLs

As suggested by Ben Hutchings <bhutchings@solarflare.com>, using the MDC/MDIO
IOCTL

Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 9948fa2..29935a9 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -2722,6 +2722,7 @@
 	select FW_LOADER
 	select ZLIB_INFLATE
 	select LIBCRC32C
+	select MDIO
 	help
 	  This driver supports Broadcom NetXtremeII 10 gigabit Ethernet cards.
 	  To compile this driver as a module, choose M here: the module