pdl: Remove unused Clippy lint

The lint is unknown in older Rust versions. We’re already well past
Rust 1.63 in master, so we don’t actually need this line any longer.

This is for integration with UWB.

Tag: #feature
Bug: 228306436
Test: atest pdl_tests pdl_rust_generator_tests_{le,be}
Change-Id: Iadc80b884b274e31d24620315d9eb6cec2770716