csky: simplify alignment sysctl registration

Using register_sysctl_paths() is only required if we are using
leafs with entries but all we are doing is creates leafs with
just one leaf and then entries and register_sysctl_init() works
well with that already.

The 555 permission is already retained by the new_dir() proc
sysctl directory creator.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>