The generic platform driver pcie-designware-plat.c doesn't work for
UniPhier PCIe host controller, because the controller has some
necessary initialization sequence for the controller-specific logic.

Currently the controller doesn't use "snps,dw-pcie" compatible,
so this is no longer needed. Remove the compatible string from the
pcie node.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20220913042321.4817-10-hayashi.kunihiko@socionext.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>