android: support unlock and rollback indexes in avb protocol

FW-side implementation:
go/akq/c/overlays/qcom-lanai15-incoming/abl/tianocore/edk2/+/2184633

Test: pineapple booted
Bug: 337846185
Bug: 374684404
Change-Id: I5d27fae994e9e67294885e93e1fc1e077f4dc05b
Signed-off-by: Dmitrii Merkurev <dimorinny@google.com>