Provide complete API surfaces for *non-updatable compatibility checks

Previously, the non public `*api-stubs-docs-non-updatable` modules only
provided a partial set of the previously released API against which
compatibility checks were performed. This change provides a complete
set of them.

Bug: 316873097
Test: m checkapi
      # Check the contents of system-*-non-updatable's
      # metalava_exportable.sbox.textproto to make sure it contains
      # system AND public, not just system APIs.
Change-Id: Iba8ad79c264621ae0e0e4b261fc51dd50820061b