Move NetworkStack in-process from lib to APK

This makes the in-process configuration closer to the "standard" module
configuration, by using an APK in both cases, but making sure that
svelte builds use an in-process service to avoid the memory impact.

Bug: 127908503
Test: svelte build boots and has functional WiFi
Change-Id: I59f44df7c23a24429e9fe6be034260373e33a994