rockchip: remove redundant 'console' parameter from boot script

ttyS2 is the default console used for all rockchip boards.
The redundant 'console=tty1' parameter now breaks the console due to
recent procd update.

Signed-off-by: Tianling Shen <[email protected]>

target/linux/rockchip/image/default.bootscript

@@ -8,7 +8,7 @@ elif test $stdout = 'serial@ff1a0000' ;
 then serial_addr=',0xff1a0000';
 fi;
 
-setenv bootargs "console=ttyS2,1500000 console=tty1 earlycon=uart8250,mmio32${serial_addr} root=PARTUUID=${uuid} rw rootwait";
+setenv bootargs "console=ttyS2,1500000 earlycon=uart8250,mmio32${serial_addr} root=PARTUUID=${uuid} rw rootwait";
 
 load ${devtype} ${devnum}:1 ${kernel_addr_r} kernel.img