arm64: dts: mt6359: Add missing 'compatible' property to regulators node

The 'compatible' property is required by the
'mfd/mediatek,mt6397.yaml' binding. Add it to fix the following
dtb-check error:
mediatek/mt8395-radxa-nio-12l.dtb: pmic: regulators:
'compatible' is a required property

Fixes: 3b7d143 ("arm64: dts: mt6359: add PMIC MT6359 related nodes")
Signed-off-by: Julien Massot <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: AngeloGioacchino Del Regno <[email protected]>

Author: Julien Massot

arch/arm64/boot/dts/mediatek/mt6359.dtsi

@@ -20,6 +20,8 @@
 		};
 
 		regulators {
+			compatible = "mediatek,mt6359-regulator";
+
 			mt6359_vs1_buck_reg: buck_vs1 {
 				regulator-name = "vs1";
 				regulator-min-microvolt = <800000>;