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dm-verity signed /boot #1620

Description

@DemiMarie

Is your feature request related to a problem? Please describe.
Verifying signatures on individual files in /boot is error-prone and slow.

Describe the solution you'd like
Use dm-verity and multiple possible /boot partitions. This allows atomic updates of /boot by replacing the entire partition. Heads will automatically choose the newest version.

Describe alternatives you've considered
#1599

Additional context
dm-verity is used by most other verified boot schemes.

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