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}
(cherry picked from https://android-review.googlesource.com/q/commit:c714742a025ddf9b5af40b3f73cf0196af3aed33)
Merged-In: Iadc80b884b274e31d24620315d9eb6cec2770716
Change-Id: Iadc80b884b274e31d24620315d9eb6cec2770716