The existence of the network driver ioctl() method should depend on...

The existence of the network driver ioctl() method should depend on CONFIG_NETDEV_IOCTL rather than CONFIG_NETDEV_PHY_IOCTL.  The former enables the method, the later enables a subset of possible driver IOCTLs.  This change should be basically a no-operation.  The affected ioctl methods only support those subset of driver IOCTLs selected by CONFIG_NETDEV_PHY_IOCTL and the network logic will tolerate a nul ioctl method.