PCI: rcar: Poll PHYRDY in rcar_pcie_hw_init()

In all the R-Car gen1/2/3 manuals, we are instructed to poll PCIEPHYSR
for PHYRDY=1 at an early stage of the PCIEC initialization -- while
the driver only does this on R-Car H1 (polling a PHY specific register).
Add the PHYRDY polling to rcar_pcie_hw_init(). Note that without the
special PHY driver on the R-Car V3H (R8A77980) the PCIEC initialization
just freezes the kernel -- adding the PHYRDY polling allows the init code
to exit gracefully on timeout (PHY starts powered down after reset on this
SoC).

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

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