arm64: dts: marvell: Enumerate the first AP806 syscon

There are two system controllers in the AP80x, like for ap_syscon1,
enumerate the first one by renaming it s/ap_syscon/ap_syscon0/.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

arch/arm64/boot/dts/marvell/armada-ap806.dtsi

@@ -246,7 +246,7 @@ ap_sdhci0: sdhci@6e0000 {
 				status = "disabled";
 			};
 
-			ap_syscon: system-controller@6f4000 {
+			ap_syscon0: system-controller@6f4000 {
 				compatible = "syscon", "simple-mfd";
 				reg = <0x6f4000 0x2000>;