ARM: dts: r8a7791: Use R-Car SATA Gen2 fallback compat string

Use newly added R-Car SATA Gen2 fallback compat string
in the DT of the r8a7791 SoC.

This should have no run-time effect as the driver matches against
the per-SoC compat string before the fallback compat string is considered.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm/boot/dts/r8a7791.dtsi

@@ -933,7 +933,7 @@ avb: ethernet@e6800000 {
 	};
 
 	sata0: sata@ee300000 {
-		compatible = "renesas,sata-r8a7791";
+		compatible = "renesas,sata-r8a7791", "renesas,rcar-gen2-sata";
 		reg = <0 0xee300000 0 0x2000>;
 		interrupts = <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&mstp8_clks R8A7791_CLK_SATA0>;
@@ -942,7 +942,7 @@ sata0: sata@ee300000 {
 	};
 
 	sata1: sata@ee500000 {
-		compatible = "renesas,sata-r8a7791";
+		compatible = "renesas,sata-r8a7791", "renesas,rcar-gen2-sata";
 		reg = <0 0xee500000 0 0x2000>;
 		interrupts = <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&mstp8_clks R8A7791_CLK_SATA1>;