ARM: dts: r8a7791: 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: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7791.dtsi

@@ -70,6 +70,7 @@
 			compatible = "arm,cortex-a15";
 			reg = <1>;
 			clock-frequency = <1500000000>;
+			clocks = <&cpg CPG_CORE R8A7791_CLK_Z>;
 			power-domains = <&sysc R8A7791_PD_CA15_CPU1>;
 			next-level-cache = <&L2_CA15>;
 		};