kconfig: move JUMP_NB to mconf.c

This macro is only used in mconf.c.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/expr.h

@@ -281,8 +281,6 @@ struct jump_key {
 	int index;
 };
 
-#define JUMP_NB			9
-
 extern struct file *file_list;
 extern struct file *current_file;
 struct file *lookup_file(const char *name);

scripts/kconfig/mconf.c

@@ -22,6 +22,8 @@
 #include "lkc.h"
 #include "lxdialog/dialog.h"
 
+#define JUMP_NB			9
+
 static const char mconf_readme[] =
 "Overview\n"
 "--------\n"