mdio_bus: implement devm_mdiobus_alloc/devm_mdiobus_free

Add a resource managed devm_mdiobus_alloc[_size]()/devm_mdiobus_free()
to automatically clean up MDIO bus alocations made by MDIO drivers,
thus leading to simplified MDIO drivers code.

Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-and-tested-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc Documentation/driver-model/devres.txt
Simple merge

diff --cc drivers/net/phy/mdio_bus.c
Simple merge

diff --cc include/linux/phy.h
Simple merge