net/fsl: remove dependency FSL_SOC from MDIO

FSL_PQ_MDIO and FSL_XGMAC_MDIO are not really depend on FSL_SOC, they
can build on non-PPC platforms.
Signed-off-by: NShaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/Kconfig

@@ -58,14 +58,12 @@ source "drivers/net/ethernet/freescale/fs_enet/Kconfig"
 
 config FSL_PQ_MDIO
 	tristate "Freescale PQ MDIO"
-	depends on FSL_SOC
 	select PHYLIB
 	---help---
 	  This driver supports the MDIO bus used by the gianfar and UCC drivers.
 
 config FSL_XGMAC_MDIO
 	tristate "Freescale XGMAC MDIO"
-	depends on FSL_SOC
 	select PHYLIB
 	select OF_MDIO
 	---help---