Split out the connectivity API surface

Split out connectivity APIs to connectivity module directories. This
prepares future move of the connectivity code into a mainline module,
but still keeps it implemented by framework-minus-apex for now: the API
stubs are moved to framework-connectivity.stubs, but the implementation
on device remains in the same place.

This allows moving the connectivity code in/out of APEX with minimal
changes.

BYPASS_INCLUSIVE_LANGUAGE_REASON=Moving files, can't modify released API

Bug: 171540887
Test: device boots, connectivity working

Merged-In: I21c42f032efa6c10e36c749df3183ce9679303a7
(cherry-pick from internal branch with API files conflicts)

Change-Id: I21c42f032efa6c10e36c749df3183ce9679303a7
diff --git a/services/net/Android.bp b/services/net/Android.bp
index 93aa461..b09a66e 100644
--- a/services/net/Android.bp
+++ b/services/net/Android.bp
@@ -52,6 +52,7 @@
     libs: [
         "unsupportedappusage",
         "framework-wifi-util-lib",
+        "framework-connectivity"
     ],
     static_libs: [
         // All the classes in netd_aidl_interface must be jarjar so they do not conflict with the