powerpc/ptrace: Move declaration of ptrace_get_reg() and ptrace_set_reg()

ptrace_get_reg() and ptrace_set_reg() are only used internally by
ptrace.

Move them in arch/powerpc/kernel/ptrace/ptrace-decl.h
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/376c258267aeae54a4423bc4a2e107a9611f0039.1597770847.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/ptrace.h

@@ -171,12 +171,6 @@ static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
 		set_thread_flag(TIF_NOERROR); \
 	} while(0)
 
-struct task_struct;
-extern int ptrace_get_reg(struct task_struct *task, int regno,
-			  unsigned long *data);
-extern int ptrace_put_reg(struct task_struct *task, int regno,
-			  unsigned long data);
-
 #define current_pt_regs() \
 	((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
 

arch/powerpc/kernel/ptrace/ptrace-decl.h

@@ -159,6 +159,9 @@ int tm_cgpr32_set(struct task_struct *target, const struct user_regset *regset,
 
 /* ptrace-view */
 
+int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data);
+int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data);
+
 extern const struct user_regset_view user_ppc_native_view;
 
 /* ptrace-(no)adv */

arch/powerpc/kernel/ptrace/ptrace32.c

@@ -23,6 +23,8 @@
 
 #include <asm/switch_to.h>
 
+#include "ptrace-decl.h"
+
 /*
  * does not yet catch signals sent when the child dies.
  * in exit.c or in signal.c.