Move product_packages.txt to soong

Needed for soong-only builds.

Bug: 383892968
Test: Presubmits
Change-Id: Ibc214f489d97b2eb2ff29e454af3bf1ae025b0d2
diff --git a/android/Android.bp b/android/Android.bp
index 79969a8..4e2006d 100644
--- a/android/Android.bp
+++ b/android/Android.bp
@@ -92,6 +92,7 @@
         "prebuilt.go",
         "prebuilt_build_tool.go",
         "product_config.go",
+        "product_packages_file.go",
         "proto.go",
         "provider.go",
         "raw_files.go",