tree b84d037cd5b9a0d9674251b4a2deacad135d8bd2
parent da1b3145df344b2bf597bfbb5636e1bb74642389
author Yifan Hong <elsk@google.com> 1600818960 +0000
committer Yifan Hong <elsk@google.com> 1601318333 -0700

Read boot image version from ro.bootimage.build.date.utc

This change re-defines boot image downgrade check logic. The
sysprop ro.bootimage.build.date.utc is checked instead. If the
sysprop ro.build.ab_update.gki.prevent_downgrade_version is not set,
any detected downgrades are suppressed.

Bug: 162554855
Bug: 162623577
Bug: 169169031
Test: pass

Change-Id: Ib86cb40576a852e0654a4c22d81c876d0315d0d2