Support zoned device with dm-default-key

Note that, encrypt_inplace cannot support zoned device, since it
doesn't support in-place updates. And, dm-default-key will have
a different key.

Bug: 172378121
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
Change-Id: I34cb1e747e0f3faa07c5a4bfeded11fb789a033c