Add standard rustfmt.toml

This configuration is to be used for all internal Rust crates.

Test: rustfmt --print-config current --config-path build/soong/scripts/ .
Bug: 157238653
Change-Id: Ic49027dd1530f503e2c1f781453cdee95a983252
diff --git a/scripts/rustfmt.toml b/scripts/rustfmt.toml
new file mode 100644
index 0000000..617d425
--- /dev/null
+++ b/scripts/rustfmt.toml
@@ -0,0 +1,5 @@
+# Android Format Style
+
+edition = "2018"
+use_small_heuristics = "Max"
+newline_style = "Unix"