Unify timer_init() and cpu_init() prototypes

Clean up some duplicated prototype declarations.
Get rid of now useless AVR32 initcalls.h file.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Albert Aribaud <albert.aribaud@free.fr>
Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: Graeme Russ <graeme.russ@gmail.com>

include/common.h

@@ -222,6 +222,9 @@ typedef void (interrupt_handler_t)(void *);
 
 void	hang		(void) __attribute__ ((noreturn));
 
+int	timer_init(void);
+int	cpu_init(void);
+
 /* */
 phys_size_t initdram (int);
 int	display_options (void);