Choose options format using property

To make it easier to support disk formats created using old versions
of dm-default-key with new kernels, choose the disk format to use
based on options_format_version and first_api_version properties
instead of checking the version number of the kernel module.

Bug: 150761030
Test: crosshatch and cuttlefish boot normally; cuttlefish
    fails with "default-key: Not enough arguments" as expected when
    option is set to 1
Change-Id: Ib51071b7c316ce074de72439741087b18335048c