sysctl: Add register_sysctl for normal sysctl users

The plan is to convert all callers of register_sysctl_table
and register_sysctl_paths to register_sysctl.  The interface
to register_sysctl is enough nicer this should make the callers
a bit more readable.  Additionally after the conversion the
230 lines of backwards compatibility can be removed.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 35c50ed..c34b4c8 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -1090,6 +1090,7 @@
 struct ctl_table_header *__register_sysctl_paths(
 	struct ctl_table_set *set,
 	const struct ctl_path *path, struct ctl_table *table);
+struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table);
 struct ctl_table_header *register_sysctl_table(struct ctl_table * table);
 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
 						struct ctl_table *table);