mosys: Add statfs and prctl to arm64 seccomp.

mosys is using these two syscalls in kevin64 so add them to
seccomp.

BUG=chromium:925601
TEST=no more errors.

Change-Id: I99383e5abf32dfddc0b5d473e138666af50f8420
Reviewed-on: https://chromium-review.googlesource.com/1438023
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed