Use @include for crash_dump seccomp policies.

Instead of manually inlining and updating seccomp policies for crash
dumping in 5 different places, add a central one that's @included by
each user.

Bug: http://b/38508369
Test: debuggerd [-b] `pidof media.{codec,extractor}` on walleye
Change-Id: I1691cb2ab041fc326765e7304917bd2b2460c6a9