Merge "Split gen_bp_files, make Android.bp idempotent." am: 8d6aeab882 am: d0edac4eea am: ae197196ca am: 86eef1cfab

Original change: https://android-review.googlesource.com/c/platform/development/+/1450076

Change-Id: I740ef76bcbfee2684bfd28ba5c3353d6ade27c23