staging: ion: Align cases with switch

The preferred indentation for cases and switches has the cases at
the same level as the switch.

Signed-off-by: Christopher H. Pezley <chris@pezley.net>
Acked-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>