dm: move dm_table_destroy() to same header as dm_table_create()

If anyone is going to use dm_table_create(), they probably should be
able to use dm_table_destroy() too. Move the dm_table_destroy()
definition outside the private header, near dm_table_create()

Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>