We're banning ELF prebuilts in PRODUCT_COPY_FILES. Define prebuilt
modules for vendor prebuilts so we can run check_elf_file.py on them.
Use PRODUCT_PACKAGES to install ELF prebuilts.
Bug: 152277096
Bug: 140560012
Test: run ./generate-packages.sh with BID 6345366
Test: build aosp_walleye-userdebug on \
rvc-dev-plus-aosp-without-vendor with the generated tarball
Change-Id: Ib0e0678a569c61fe7edc9f492a27811825d93bec
17bdc8b112