PCI: rcar-gen2: Add RZ/N1 SOC family compatible string

Add Renesas RZ/N1 SOC family support to the Renesas R-Car Gen2 PCI bridge
driver.

The Renesas RZ/N1 SOC internal PCI bridge is compatible with the one in the
R-Car Gen2 family.

Tested with the RZ/N1D (R9A06G032) SOC.

Link: https://lore.kernel.org/r/20220520094155.313784-4-herve.codina@bootlin.com


Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>