Add service-connectivity to legacy core platform list

It will use stable version of platform API to compile
if module is not in this list. However, service-connectivity
still has dependencies on legacy platform API so add
it into the list to use legacy platform API.

Bug: 158268939
Test: build pass if add service-connectivity into the list
      build fail without adding target into the list
Change-Id: I629ed1454def5cf8164a6079034e2c610ed0a554