ARM: shmobile: r8a7779 dtsi: Add SoC-specific SATA compatible property

The SATA node used the generic compatible property only, which was
deprecated by commit e67adb4e ("sata_rcar: Add R-Car Gen2 SATA
PHY support"). Add the SoC-specific one introduced by that commit.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7779.dtsi

@@ -303,7 +303,7 @@ tmu2: timer@ffd82000 {
 	};
 
 	sata: sata@fc600000 {
-		compatible = "renesas,rcar-sata";
+		compatible = "renesas,sata-r8a7779", "renesas,rcar-sata";
 		reg = <0xfc600000 0x2000>;
 		interrupts = <0 100 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&mstp1_clks R8A7779_CLK_SATA>;