Adds aarch64 QEMU build to output artifacts

* QEMU 9.x build for aarch64-linux-gnu.
* Adds gen_android_bp.py changes to support both architectures.

Bug: 331635690
Test: Verified build of cvd-host-package.
Change-Id: I02e404988eeb323e7090df59b6117c5a4d096bb1
2 files changed