PCI: rcar: Add R-Car gen3 PHY support

On R-Car gen3 SoCs the PCIe PHY has its own register region, thus we
need to add the corresponding code in rcar_pcie_hw_init_gen3() and call
devm_phy_optional_get() at the driver's probing time, so that the
existing R-Car gen3 device trees (not having a PHY node) would still
work (we only need to power up the PHY on R-Car V3H).

Signed-off-by: Sergei Shtylyov <[email protected]>
[[email protected]: updated commit log]
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Rob Herring <[email protected]>

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