Add readlink to mosys-seccomp.policy

To test added a readlink call to mosys (and then removed) to verify the
seccomp policy would cause the crash. With readlink added to the policy
mosys did not crash.

BUG=chromium:889552
TEST=local device tests

Change-Id: I20cd5e7a85a84b01feed67b5d893d83af1914019
Reviewed-on: https://chromium-review.googlesource.com/1299955
Commit-Ready: Gregory Meinke <gmeinke@chromium.org>
Tested-by: Gregory Meinke <gmeinke@chromium.org>
Reviewed-by: C Shapiro <shapiroc@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
3 files changed