Use sh_binary for a host shell script. am: 18e9f3ca8d am: 2b31da00b0

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1421588

Change-Id: I087ff5fa14fc7cff0dcde565e7434250ed0a89f2
diff --git a/Android.bp b/Android.bp
index f61b255..a8b5fc2 100644
--- a/Android.bp
+++ b/Android.bp
@@ -730,12 +730,12 @@
 
 // Brillo update payload generation script
 // ========================================================
-cc_prebuilt_binary {
+sh_binary {
     name: "brillo_update_payload",
     device_supported: false,
     host_supported: true,
 
-    srcs: ["scripts/brillo_update_payload"],
+    src: "scripts/brillo_update_payload",
     required: [
         "delta_generator",
         "shflags",