wdt_util: Fix seccomp linting errors for arm platform

Updated 'getrandom` syscall policy according to linter recommendation.
Updated 'ioctl' syscall policy to match amd64 and also to fix seccomp
linting rules.

BUG=b:313131179
TEST=Downgrade weida touch firmware on jacuzzi DUT.
     `emerge-jacuzzi touch_updater;`
     `cros deploy ${DUT} touch_updater;`
      check the kernel log /var/log/messages.

Change-Id: I28c37003c09842ab411f20b0b5ec9544baf361c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/touch_updater/+/5085649
Tested-by: Henry Barnor <hbarnor@chromium.org>
Commit-Queue: ChromeOS Auto Retry <chromeos-auto-retry@chromeos-bot.iam.gserviceaccount.com>
Reviewed-by: Kenneth Albanowski <kenalba@google.com>
Reviewed-by: William Mahon <wmahon@google.com>
2 files changed