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When building bsp/cvitek/c906_little, compiler warns: ``` board/board.c: In function 'rt_hw_board_init': board/board.c:26:5: warning: implicit declaration of function 'rt_hw_tick_init'; did you mean 'rt_hw_stack_init'? [-Wimplicit-function-declaration] 26 | rt_hw_tick_init(); | ^~~~~~~~~~~~~~~ | rt_hw_stack_init board/board.c:29:5: warning: implicit declaration of function 'rt_hw_uart_init'; did you mean 'rt_hw_board_init'? [-Wimplicit-function-declaration] 29 | rt_hw_uart_init(); | ^~~~~~~~~~~~~~~ | rt_hw_board_init ``` To remove these build warnings, include header files which declare these functions. Plus, remove the decalartion of `tick_isr()`, this function does not exist. Signed-off-by: Chen Wang <unicorn_wang@outlook.com>