Commitc37a668481("stm32mp: fix compilation issue with DEBUG_UART") split the debug UART initialization code into two files, but failed to update other non-ST boards. This did not lead to noticeable breakage until debug UART is enabled, which is not the default. Update the Makefile accordingly to allow debug UART to work. Fixes:c37a668481("stm32mp: fix compilation issue with DEBUG_UART") Signed-off-by: Marek Vasut <marek.vasut@mailbox.org> Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>