arm64: dts: mt7622: fix sata

[    2.480551] ahci-mtk 1a200000.sata: missing phy-mode phandle
[    2.486249] ahci-mtk 1a200000.sata: probe with driver ahci-mtk failed with error -22

Fixes: 3ba5a61 ("arm64: dts: mediatek: mt7622: fix clock controllers")

Author: frank-w

arch/arm64/boot/dts/mediatek/mt7622.dtsi

@@ -790,7 +790,7 @@
 	};
 
 	pciesys: clock-controller@1a100800 {
-		compatible = "mediatek,mt7622-pciesys";
+		compatible = "mediatek,mt7622-pciesys","syscon";
 		reg = <0 0x1a100800 0 0x1000>;
 		#clock-cells = <1>;
 		#reset-cells = <1>;