rockchip: rk3399: add board_debug_uart_init()

Use board_debug_uart_init() for UART iomux init instead of
do it in board_init_f, and move the function to soc file so
that we can find all the soc/board setting in soc file and
use a common board file for all rockchip SoCs later.

Signed-off-by: Kever Yang <[email protected]>
Reviewed-by: Philipp Tomsich <[email protected]>

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