Add internal PCI bridge support for the R9A06G032 SOC. The Renesas RZ/N1D
(R9A06G032) internal PCI bridge is compatible with the one present in the
R-Car Gen2 family, but compared to R-Car Gen2, it needs three clocks
instead of one.

The 'resets' property is not required for the RZ/N1 family.

Link: https://lore.kernel.org/r/20220520094155.313784-3-herve.codina@bootlin.comSigned-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Rob Herring <robh@kernel.org>