seccomp: allow clock_gettime

Flashrom is needing this syscall now.  Allow it for mosys minijail.

BUG=b:172384436
TEST="mosys eventlog list" on elm

Change-Id: I19921461e6aedfc9b26248d8d33c38b675105554
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mosys/+/2531218
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
3 files changed