libfs_avb: support loading vbmeta structs from any partition
This commits adds the following two public functions into class AvbHandle, and verified by 'libfs_avb_test': static AvbUniquePtr LoadAndVerifyVbmeta(); // loads inline vbmeta. static AvbUniquePtr LoadAndVerifyVbmeta( // loads offline vbmeta. const std::string& partition_name, const std::string& ab_suffix, const std::string& ab_other_suffix, const std::string& expected_public_key, const HashAlgorithm& hash_algorithm, bool allow_verification_error, bool load_chained_vbmeta, bool rollback_protection, std::function<std::string(const std::string&)> custom_device_path = nullptr); The first function LoadAndVerifyVbmeta() will be used to replace Open(), in a separate CL in the future. Many libfs_avb internal utils are added into avb_util.cpp as well, which are verified by 'libfs_avb_internal_test'. Bug: 112103720 Bug: 117960205 Test: atest libfs_avb_test Test: atest libfs_avb_internal_test Change-Id: I807b8af0b69c9a4511f6f120e9754aca5442830e
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