Build owners.zip with soong

For soong-only builds. Also makes adding/removing an OWNERS file not
require re-analysis.

Fixes: 422222547
Test: diff out/target/product/vsoc_x86_64_only/obj/PACKAGING/owners_intermediates/owners.zip out/soong/OWNERS.zip
Change-Id: I4c4088333b54987e36c0b093c91d9c6136daa5f3