xtensa: ptrace: add prototypes to <asm/ptrace.h>

Add prototype for do_syscall_trace_enter() to asm/ptrace.h.
Move prototype for do_syscall_trace_leave() there to be consistent.

Fixes a build warning:

arch/xtensa/kernel/ptrace.c:545:5: warning: no previous prototype for 'do_syscall_trace_enter' [-Wmissing-prototypes]
  545 | int do_syscall_trace_enter(struct pt_regs *regs)
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Message-Id: <20230920052139.10570-5-rdunlap@infradead.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/include/asm/ptrace.h

@@ -106,6 +106,9 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
 	return regs->areg[2];
 }
 
+int do_syscall_trace_enter(struct pt_regs *regs);
+void do_syscall_trace_leave(struct pt_regs *regs);
+
 #else	/* __ASSEMBLY__ */
 
 # include <asm/asm-offsets.h>

arch/xtensa/kernel/ptrace.c

@@ -541,7 +541,6 @@ long arch_ptrace(struct task_struct *child, long request,
 	return ret;
 }
 
-void do_syscall_trace_leave(struct pt_regs *regs);
 int do_syscall_trace_enter(struct pt_regs *regs)
 {
 	if (regs->syscall == NO_SYSCALL)