Update Android.bp by running cargo_embargo

Test: ran cargo_embargo
Change-Id: Ib5d35a0357f2a1355ddcdac2399fedb005f91859
diff --git a/Android.bp b/Android.bp
index 5e8b6c5..53860bd 100644
--- a/Android.bp
+++ b/Android.bp
@@ -8,6 +8,6 @@
     crate_name: "pathdiff",
     cargo_env_compat: true,
     cargo_pkg_version: "0.2.1",
-    srcs: ["src/lib.rs"],
+    crate_root: "src/lib.rs",
     edition: "2018",
 }