ARM: dts: uniphier: Add ahci controller nodes for PXs2

Add ahci core controller and glue layer nodes including reset-controller
and sata-phy.

This supports for PXs2 and the boards without PXs2 vodka board that
doesn't implement any SATA connectors.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20220913042249.4708-8-hayashi.kunihiko@socionext.com

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>