cpmac: Remove references to BUS_ID_SIZE, use MII_BUS_ID_SIZE.

	void __iomem *regs;

	struct mii_bus *mii_bus;

	struct phy_device *phy;

	char phy_name[BUS_ID_SIZE];

	char phy_name[MII_BUS_ID_SIZE + 3];

	int oldlink, oldspeed, oldduplex;

	u32 msg_enable;

	struct net_device *dev;