hwservicemanager and the allocator are moved to system_ext

We want to remove these by default from Android U+ devices and still
allow some devices to add them back. So they are moved to system_ext.

Test: m && launch_cvd # check for hwservicemanager running
Bug: 218588089

Change-Id: Ia6f7b41a7b37057518a28aea1ec43e3f87e7fa30
3 files changed