ARM: dts: meson8b: add the SCU device node

Amlogic's Meson8b SoC has a Snoop Control Unit (SCU), just like many
other Cortex-A5 SoCs. Add the corresponding devicetree node so it can be
used during SMP boot.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm/boot/dts/meson8b.dtsi

@@ -82,6 +82,11 @@
 			reg = <0x203>;
 		};
 	};
+
+	scu@c4300000 {
+		compatible = "arm,cortex-a5-scu";
+		reg = <0xc4300000 0x100>;
+	};
 }; /* end of / */
 
 &aobus {