km/powerpc: fix ft_board_setup prototype for km82xx & km83xx

Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>

board/keymile/km82xx/km82xx.c

@@ -447,7 +447,7 @@ int get_scl(void)
 	return get_pin(SCL_MASK, 3);
 }
 
-void ft_board_setup(void *blob, bd_t *bd)
+int ft_board_setup(void *blob, bd_t *bd)
 {
 	ft_cpu_setup(blob, bd);
 

board/keymile/km83xx/km83xx.c

@@ -361,7 +361,7 @@ int checkboard(void)
 	return 0;
 }
 
-void ft_board_setup(void *blob, bd_t *bd)
+int ft_board_setup(void *blob, bd_t *bd)
 {
 	ft_cpu_setup(blob, bd);