proc: Move some bits from linux/proc_fs.h to linux/{of.h,signal.h,tty.h}

Move some bits from linux/proc_fs.h to linux/of.h, signal.h and tty.h.

Also move proc_tty_init() and proc_device_tree_init() to fs/proc/internal.h as
they're internal to procfs.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
cc: devicetree-discuss@lists.ozlabs.org
cc: linux-arch@vger.kernel.org
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: Jri Slaby <jslaby@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/signal.h b/include/linux/signal.h
index a2dcb94..1135e36 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -434,4 +434,9 @@
 int restore_altstack(const stack_t __user *);
 int __save_altstack(stack_t __user *, unsigned long);
 
+#ifdef CONFIG_PROC_FS
+struct seq_file;
+extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);
+#endif
+
 #endif /* _LINUX_SIGNAL_H */