arm64: dts: r8a7795: Add missing power-domains property for sata

This went unnoticed as the sata_rcar driver doesn't support Runtime PM
yet, but manages module clocks manually.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a7795.dtsi

@@ -1148,6 +1148,7 @@ sata: sata@ee300000 {
 			reg = <0 0xee300000 0 0x1fff>;
 			interrupts = <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&cpg CPG_MOD 815>;
+			power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
 			status = "disabled";
 		};