bsp: cvitek: c906_littel: fixed build warnings for board.c

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 <[email protected]>

0 files changed, 0 insertions, 0 deletions