avr32: use syscall prototypes from asm-generic instead of arch

This patch removes the redundant syscalls prototypes in the architecture
specific syscalls.h header file. These were identical with the ones in
asm-generic/syscalls.h.
Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Reported-by: Peter Huewe <PeterHuewe@gmx.de>
Reported-by: Sven Schnelle <svens@stackframe.org>
Cc: stable <stable@kernel.org>

arch/avr32/include/asm/syscalls.h

@@ -16,18 +16,9 @@
 #include <linux/signal.h>
 
 /* kernel/process.c */
-asmlinkage int sys_fork(struct pt_regs *);
 asmlinkage int sys_clone(unsigned long, unsigned long,
 			 unsigned long, unsigned long,
 			 struct pt_regs *);
-asmlinkage int sys_vfork(struct pt_regs *);
-asmlinkage int sys_execve(const char __user *, char __user *__user *,
-			  char __user *__user *, struct pt_regs *);
-
-/* kernel/signal.c */
-asmlinkage int sys_sigaltstack(const stack_t __user *, stack_t __user *,
-			       struct pt_regs *);
-asmlinkage int sys_rt_sigreturn(struct pt_regs *);
 
 /* mm/cache.c */
 asmlinkage int sys_cacheflush(int, void __user *, size_t);