Include vendor partitions in target zip generation

This change will enable the target zip to include partition defined in
BRILLO_VENDOR_PARTITIONS. This is necessary for OTA to support
partitions other than boot and system in ab_partitions.txt.

BUG: 28623063
Change-Id: I6e0969c31c9ad2e8285c6f560825c160aa8c4d55
2 files changed