dt-bindings: ata: renesas,rcar-sata: Make power-domains and resets required

The "power-domains" property is present on all supported platforms.
The "resets" property is present on all but R-Car H1.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/ca35d7d837b155c69232a1c25060737b4c87720f.1619700260.git.geert+renesas@glider.be


Signed-off-by: Rob Herring <robh@kernel.org>