When avb_hash_algorithm is set, for filesystem type build targets,
add_hashtree_footer will be called with the appropriate --hash_algorithm
flag.
Bug: 262892300
Test: Build succeeds
Merged-In: If2f9c9aa1e98314b3d3e2f8bf25c1bab193f908e
Merged-In: Ief4b0f0fd89ebf64b45b29962a3811698bc922d6
Change-Id: I3bf5aecbfd717036a5b167696b107ee6cb1830b4