PCI: MVEBU: Power on the PCIe phys using the phy framework

Some Marvell SoCs can power on/off the PCIe phys, in order to save
power. Make use of the PHY framework to support this.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Phy: Add DT nodes on kirkwood for the PCIe PHY

Add nodes for the two PCIe PHYs on kirkwood.
Add pHandles to the PHYs in the PCIe nodes.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
ARM: defconfig: Enable generic phy in dove and kirkwood.

Now that there are phy drivers for sata and pcie, enable generic phy
in the kirkwood and dove defconfig.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
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