ARM: dts: BCM5301X: remove earlycon on ASUS RT-AC3100 and ASUS RT-AC88U

Remove the earlycon boot argument. As Krzysztof pointed out, earlycon is
for debugging, not regular mainline usage.

Signed-off-by: Arınç ÜNAL <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Florian Fainelli <[e-mail]>

arch/arm/boot/dts/broadcom/bcm47094-asus-rt-ac3100.dtsi

···
 #include <dt-bindings/leds/common.h>
 
 / {
-	chosen {
-		bootargs = "earlycon";
-	};
-
 	memory@0 {
 		device_type = "memory";
 		reg = <0x00000000 0x08000000>,