[dice] Optimize retry_with_bigger_buffer in dice's Rust wrapper

This cl replaces the loop of buffer size request in the rust
wrapper of the open-dice library with a single request as the
latter is now supported in DICE.

Test: atest libdiced_sample_inputs.integration_test
Bug: 272787330
Change-Id: I3d4ea3b89d30476e6a16b5fbdf155ebd1c23525d
6 files changed