DynamicPartitionControl: support retrofit devices

On retrofit devices:

* The retrofit update includes block devices at source
  slot (for example, system_a, vendor_a, product_a).
  This is done automatically because the retrofit update
  does not look different from regular updates in OTA
  client's perspective.

* The first update after the retrofit update includes
  the rest of the block devices (in the above example,
  system_b, vendor_b and product_b).

In order to do the second,

* use NewForUpdate() API from liblp to automatically
  include block devices at the target slot when the metadata
  is loaded.

* Use FlashPartitionTable() API to flash metadata to system_b
  directly without reading existing metadata from it.

Test: manual OTA on retrofit devices
Bug: 118506262
Change-Id: Ib2c15b8a1a04271320bfef408813723a5b2a7bd7