ARM: sun6i: dt: Add IP needed to bring up the additional cores

Add the PRCM and CPU configuration units needed for SMP in the A31 DTSI.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun6i-a31.dtsi

@@ -319,5 +319,15 @@
 			#interrupt-cells = <3>;
 			interrupts = <1 9 0xf04>;
 		};
+
+		cpucfg@01f01c00 {
+			compatible = "allwinner,sun6i-a31-cpuconfig";
+			reg = <0x01f01c00 0x300>;
+		};
+
+		prcm@01f01c00 {
+			compatible = "allwinner,sun6i-a31-prcm";
+			reg = <0x01f01400 0x200>;
+		};
 	};
 };