Mark board_init_[fr] as noreturn

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

include/common.h

@@ -203,8 +203,8 @@ void	init_cmd_timeout(void);
 void	reset_cmd_timeout(void);
 
 /* lib_$(ARCH)/board.c */
-void	board_init_f  (ulong);
-void	board_init_r  (gd_t *, ulong);
+void	board_init_f  (ulong) __attribute__ ((noreturn));
+void	board_init_r  (gd_t *, ulong) __attribute__ ((noreturn));
 int	checkboard    (void);
 int	checkflash    (void);
 int	checkdram     (void);