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Currently, the device doesn't mount verified partitions if the
verity table signature is invalid, which usually means it fails to
boot. This change instead sets up dm-verity with an invalid root
hash and triggers device-specific error handling to recover from
the corruption.

Bug: 24256506
Change-Id: I6d693306fa0e7459c5500b028e433df61ecea6fb
(cherry picked from commit 47caa5c3)