Update Android.bp by running cargo_embargo

Test: ran cargo_embargo
Change-Id: I68a7c0252a5fd08a9be103b98f3693a08ad8157f
diff --git a/Android.bp b/Android.bp
index 99a96f7..a459522 100644
--- a/Android.bp
+++ b/Android.bp
@@ -45,7 +45,7 @@
     crate_name: "half",
     cargo_env_compat: true,
     cargo_pkg_version: "2.2.1",
-    srcs: ["src/lib.rs"],
+    crate_root: "src/lib.rs",
     edition: "2021",
     features: [
         "alloc",
@@ -65,7 +65,7 @@
     crate_name: "half",
     cargo_env_compat: true,
     cargo_pkg_version: "2.2.1",
-    srcs: ["src/lib.rs"],
+    crate_root: "src/lib.rs",
     edition: "2021",
     features: ["alloc"],
     apex_available: [