rockchip: defconfig: remove CONFIG_SYS_NS16550
We have enable NS16550 in Kconfig, do not need enable at defconfig
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>