system/rust: Set imports_granularity rustfmt option to Module

This matches the Fuchsia style. See https://fxbug.dev/340943530
for rationale.

I've also reformatted all Rust files under system/rust with this style
as there seemed to be some inconsistencies.

Fix: 396241824
Test: m com.android.btservices
Flag: EXEMPT refactor only
Change-Id: I74425bfbe98a402fa5f9fd5f1746a00b9767a321

1 files changed, 4 insertions, 1 deletions

diff --git a/system/rust/build.rs b/system/rust/build.rs
index bae31cdcaa..08cb84c6a2 100644
--- a/system/rust/build.rs
+++ b/system/rust/build.rs
@@ -2,7 +2,10 @@
 //!
 //! Run `cargo install --path .` in `external/rust/crates/pdl-compiler` to ensure `pdlc`
 //! is in your path.
-use std::{env, fs::File, io::Write, path::Path};
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
 
 fn main() {
     let out_dir = env::var_os("OUT_DIR").unwrap();