Allow vbmeta_system to be OTA'd

This CL adds vbmeta_system to the list AB_OTA_PARTITIONS.

Bug: 121997362
Bug: 130337990
Bug: 137153285
Test: python $TOP/system/update_engine/scripts/update_device.py
<ota-img.zip>
Signed-off-by: Hridya Valsaraju <hridya@google.com>
Signed-off-by: Randall Huang <huangrandall@google.com>
Signed-off-by: Leo Liou <leoliou@google.com>
Change-Id: I3142c62125addf49d43b67f328969ad55f924aec
2 files changed