Disable AVB check by default.

- At build time, AVB versions are used to sign images and the
  compatibility is implied.
- At boot time, the device won't even boot if AVB versions are incompatible.
- The benefit of keeping the check in OTA does more harm than
  good. So the check is removed.

Bug: 117914319
Test: boots
Change-Id: Id0feeaf56cbbc73c20a1e4382c106e595aad2964
4 files changed