ARM: dts: meson8: add the APB bus

Various peripherals (Mali GPU, NAND controller, VPU, etc.) are located
in the APB bus. Describe this bus so we can add devices to it.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm/boot/dts/meson8.dtsi

@@ -201,6 +201,14 @@ power-firmware@4f00000 {
 			no-map;
 		};
 	};
+
+	apb: bus@d0000000 {
+		compatible = "simple-bus";
+		reg = <0xd0000000 0x200000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x0 0xd0000000 0x200000>;
+	};
 }; /* end of / */
 
 &aobus {