rmi4update: Add clock_gettime to arm64 seccomp policy

Fixes a crash when a firmware update is attempted on arm64.

BUG=b:312799201
TEST=CQ
TEST=`emerge-jacuzzi touch_updater;` \
     `cros deploy ${DUT} touch_updater;` \
     `minijail0 -S /opt/google/touch/policies/rmi4update.update.policy \
     ${RMI_TOOL} -f -d ${DEVICE} ${FW_FILE}` \
     Reboot and check /var/log/messages for update script errors.

Change-Id: I257d0614294c7b2f9a7206bdee68070b0c826651
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/touch_updater/+/5106592
Reviewed-by: Kenneth Albanowski <kenalba@google.com>
Commit-Queue: Henry Barnor <hbarnor@chromium.org>
Tested-by: Henry Barnor <hbarnor@chromium.org>
1 file changed