ARC: [dts] Rename cpu_intc -> core_intc

This is again for future changes to use common DTSI for timers which
refer to @core_intc

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/boot/dts/nsimosci.dts

@@ -14,7 +14,7 @@
 	clock-frequency = <20000000>;	/* 20 MHZ */
 	#address-cells = <1>;
 	#size-cells = <1>;
-	interrupt-parent = <&intc>;
+	interrupt-parent = <&core_intc>;
 
 	chosen {
 		/* this is for console on PGU */
@@ -35,7 +35,7 @@
 		/* child and parent address space 1:1 mapped */
 		ranges;
 
-		intc: interrupt-controller {
+		core_intc: interrupt-controller {
 			compatible = "snps,arc700-intc";
 			interrupt-controller;
 			#interrupt-cells = <1>;