rmi4update: Fix seccomp linting errors for arm64 platform

Updated 'getrandom` syscall policy according to linter recommendation.

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: I7be554895fca73655c61f7829cdf0c601d9c23cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/touch_updater/+/5106591
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Henry Barnor <hbarnor@chromium.org>
Tested-by: Henry Barnor <hbarnor@chromium.org>
1 file changed