Generate OTA for non-A/B devices with dynamic partitions

Test: sideload full OTA on cuttlefish
Test: sideload incremental OTA on cuttlefish (that grows
      system, shrinks vendor, and move vendor to group foo)

Bug: 111801737

Change-Id: Ie8a267a90b4df9e9e0a2fbcc1b582ab2e353df52