arm64: dts: meson: g12a: add peripheral clock controller

Add the peripheral clock controller to the g12a SoC DT
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm64/boot/dts/amlogic/meson-g12a.dtsi

@@ -99,6 +99,19 @@ hiu: bus@3c000 {
 				#address-cells = <2>;
 				#size-cells = <2>;
 				ranges = <0x0 0x0 0x0 0x3c000 0x0 0x1400>;
+
+				hhi: system-controller@0 {
+					compatible = "amlogic,meson-gx-hhi-sysctrl",
+						     "simple-mfd", "syscon";
+					reg = <0 0 0 0x400>;
+
+					clkc: clock-controller {
+						compatible = "amlogic,g12a-clkc";
+						#clock-cells = <1>;
+						clocks = <&xtal>;
+						clock-names = "xtal";
+					};
+				};
 			};
 		};