Use macro explicitly rather than using #[macro_use].

This makes it more clear where it comes from.

Bug: 261037227
Test: m authorization_service_fuzzer
Change-Id: Ifc68ccf8e40fe262f8c823a1d1bd6ebd1700454b
diff --git a/keystore2/src/fuzzers/aidl-fuzzers/authorization_service_fuzzer.rs b/keystore2/src/fuzzers/aidl-fuzzers/authorization_service_fuzzer.rs
index c1b2098..9f83b40 100644
--- a/keystore2/src/fuzzers/aidl-fuzzers/authorization_service_fuzzer.rs
+++ b/keystore2/src/fuzzers/aidl-fuzzers/authorization_service_fuzzer.rs
@@ -16,11 +16,10 @@
 
 #![allow(missing_docs)]
 #![no_main]
-#[macro_use]
-extern crate libfuzzer_sys;
 
 use binder_random_parcel_rs::fuzz_service;
 use keystore2::authorization::AuthorizationManager;
+use libfuzzer_sys::fuzz_target;
 
 fuzz_target!(|data: &[u8]| {
     let authorization_service = AuthorizationManager::new_native_binder().unwrap_or_else(|e| {