phylib: Support registering a bunch of drivers

If registering of one of them fails, all already registered drivers
of this module will be unregistered.

Use the new register/unregister functions in all drivers
registering more than one driver.

amd.c, realtek.c: Simplify: directly return registration result.

Tested with broadcom.c
All others compile-tested.

Signed-off-by: Christian Hohnstaedt <chohnstaedt@innominate.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/phy.h b/include/linux/phy.h
index c35299e..93b3cf7 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -533,7 +533,9 @@
 int genphy_suspend(struct phy_device *phydev);
 int genphy_resume(struct phy_device *phydev);
 void phy_driver_unregister(struct phy_driver *drv);
+void phy_drivers_unregister(struct phy_driver *drv, int n);
 int phy_driver_register(struct phy_driver *new_driver);
+int phy_drivers_register(struct phy_driver *new_driver, int n);
 void phy_state_machine(struct work_struct *work);
 void phy_start_machine(struct phy_device *phydev,
 		void (*handler)(struct net_device *));