Add getxattr, prlimit64 and ugetrlimit to policy files

Fixes a crash found in http://shortn/_PmFqUu7Mar
and http://shortn/_85m8Ik1GiO .

BUG=b:235960683
TEST=CQ

Change-Id: I06838eafdbc50d5f183e3eed39b20f64c17611f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/touch_updater/+/3910681
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Harry Cutts <hcutts@chromium.org>
Auto-Submit: Manoj Gupta <manojgupta@chromium.org>
6 files changed