Igor Opaniuk of Linaro posted a patch to the U-Boot list, adding Android Verified Boot 2.0 support:

This series of patches introduces support of Android Verified B oot 2.0,which provides integrity checking of Android partitions on MMC. It integrates libavb/libavb_ab into the U-boot, provides implementation of AvbOps, subset of `avb` commands to run verification chain (and for debugging purposes), and it enables AVB2.0 verification on AM57xx HS SoC by default. Currently, there is still no support for verification of A/B boot slots and no rollback protection (for storing rollback indexes there are plans to use eMMC RPMB). Libavb/libavb_ab will be deviated from AOSP upstream in the future, that’s why minimal amount of changes were introduced into the lib sources, so checkpatch may fail. For additional details check [1] AVB 2.0 README and doc/README.avb2, which is a part of this patchset.[…]

https://lists.denx.de/pipermail/u-boot/2018-April/326562.html