include policy files within media APEX files

ensures that the @include'd policy files (code_coverage, crash_dump)
used by mainlined media processes are carried within the respective
APEX files. Parent policy files now @include the copy held within
the apex.

Bug: 147914640
Test: built/booted/examined filesystem
Change-Id: I34213fbc93ca51696b6a5a3c60bfd3ffa7ce6764