[MIPS] Move die and die_if_kernel() from system.h to ptrace.h

This eleminates the need to include ptrace.h into system.h and fixes a
harmless namespace conflict on the PC symbol in bpck.c.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

include/asm-mips/ptrace.h

@@ -82,6 +82,14 @@ struct pt_regs {
 
 extern asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit);
 
+extern NORET_TYPE void die(const char *, struct pt_regs *);
+
+static inline void die_if_kernel(const char *str, struct pt_regs *regs)
+{
+	if (unlikely(!user_mode(regs)))
+		die(str, regs);
+}
+
 #endif
 
 #endif /* _ASM_PTRACE_H */

include/asm-mips/system.h

@@ -19,7 +19,6 @@
 #include <asm/barrier.h>
 #include <asm/cpu-features.h>
 #include <asm/dsp.h>
-#include <asm/ptrace.h>
 #include <asm/war.h>
 
 
@@ -336,14 +335,6 @@ extern void *set_except_vector(int n, void *addr);
 extern unsigned long ebase;
 extern void per_cpu_trap_init(void);
 
-extern NORET_TYPE void die(const char *, struct pt_regs *);
-
-static inline void die_if_kernel(const char *str, struct pt_regs *regs)
-{
-	if (unlikely(!user_mode(regs)))
-		die(str, regs);
-}
-
 extern int stop_a_enabled;
 
 /*