init: move `MarkServicesUpdate` later

MarkServicesUpdate() starts delayed services which are mostly for
APEXes. (e.g. start a service from APEX). But before
"DefaultNamespaceReady", services are started in "bootstrap" mount
namespace, which makes services from non-bootstrap APEXes fail to start.

This is a quick fix for the problem before coming up with better
solution in the future.

Bug: 293535323
Test: add 'start adbd' before 'perform_apex_config' in init.rc
      adbd starts successfully.
Change-Id: I846689f7c38cdca83c1f7faec0106b8174527e09