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In order to add a generic MIPS debug_uart_init call right before the call to board_early_init_f, we need to remove all calls to debug_uart_init from every MIPS boards. WDR4300 doesn't provide a board_debug_uart_init and configures pinmux in board_early_init_f instead. Since I have no idead of what's the needed uart pinmux config, I copied the whole pinmux config to a new function that is called from board_early_init_f if CONFIG_DEBUG_UART_BOARD_INIT is not enabled. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>