ARM: dts: r8a7792: Add missing clock for secondary CA15 CPU core

Currently only the primary CPU in the CA15 cluster has a clocks
property, while the secondary CPU core is driven by the same clock.
Add the missing clocks property to fix this.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7792.dtsi

@@ -56,6 +56,7 @@ cpu1: cpu@1 {
 			compatible = "arm,cortex-a15";
 			reg = <1>;
 			clock-frequency = <1000000000>;
+			clocks = <&cpg CPG_CORE R8A7792_CLK_Z>;
 			power-domains = <&sysc R8A7792_PD_CA15_CPU1>;
 			next-level-cache = <&L2_CA15>;
 		};