arm64: dts: renesas: r8a77965: Correct whitespace

Add missing space after comma.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a77965.dtsi

@@ -67,7 +67,7 @@
 		};
 
 		a57_1: cpu@1 {
-			compatible = "arm,cortex-a57","arm,armv8";
+			compatible = "arm,cortex-a57", "arm,armv8";
 			reg = <0x1>;
 			device_type = "cpu";
 			power-domains = <&sysc R8A77965_PD_CA57_CPU1>;