Update 'Cargo.toml' file for 'libzbi' and 'libgbl'

Fixed `cargo build` for both libraries.
Minor fixed to make compiler happy.
Missing `avb_rs` dependency sinci it doesn't have cargo file.

Test: cargo build
Bug: 312785837
Change-Id: Ib4cbed1e709064673b5ffabdc0fff7228bf3c939