rockchip: enable DEBUG_UART_BOARD_INIT by default

All Rockchip SoCs use DEBUG_UART_BOARD_INIT to init per board
UART IOMUX, enable it by default.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
2 files changed