[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:tpm-seed-in-live-layer into livecd-rootfs:ubuntu/master

[Dan Bungert]

>  It requires https://github.com/canonical/subiquity/pull/1993 to work though.

Given more recent conversations, is this still true?
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/466202
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