Phy: Add a PHY driver for Marvell MVEBU SATA PHY.

Kirkwood and Dove can turn the SATA phy on and off. Add a PHY driver
to control this.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --cc drivers/phy/Kconfig
Simple merge

diff --cc drivers/phy/Makefile
Simple merge

diff --cc drivers/phy/phy-mvebu-sata.c
Simple merge