ucc_geth: really fix section mismatch

Commit ed7e63a5 has tried to fix
section mismatch:

WARNING: vmlinux.o(.init.text+0x17278): Section mismatch: reference to
.exit.text:uec_mdio_exit (between 'ucc_geth_init' and 'uec_mdio_init')

But that mismatch still happens.

This patch actually fixing section mismatch by removing __exit from
the header file.
Signed-off-by: NAnton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/ucc_geth_mii.h

@@ -96,5 +96,5 @@ enum enet_tbi_mii_reg {
 int uec_mdio_read(struct mii_bus *bus, int mii_id, int regnum);
 int uec_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value);
 int __init uec_mdio_init(void);
-void __exit uec_mdio_exit(void);
+void uec_mdio_exit(void);
 #endif				/* __UEC_MII_H */