ARM: dts: bcm21664: Replace spaces with a tab

Fix checkpatch warning:

WARNING: please, no spaces at the start of a line

Signed-off-by: Stanislav Jakubek <[e-mail]>
Signed-off-by: Florian Fainelli <[e-mail]>

arch/arm/boot/dts/bcm21664.dtsi

···
 		bootargs = "console=ttyS0,115200n8";
 	};
 
-       cpus {
+	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;