Build boot.zip in soong

For soong-only builds.

Fixes: 396197317
Test: diff out/soong/.intermediates/build/soong/dex_bootjars/android_common/boot_zip/boot.zip out/target/product/vsoc_x86_64/boot.zip
Change-Id: Id8e3d12157be2d85cb06b2e2d48d6e3d305b10e6