gdixupdate: Add munmap syscall to seccomp

Allow the munmap syscall for gdixupdate. It was causing
crashes in firmware update process. munmap is already
allowed for other update tools.

BUG=b:239989317
TEST=emerge-${B} touch_updater; cros deploy ${DUT} touch_updater;
     Run gdixupdate on DUT and it no longer crashes.
TEST=CQ

Change-Id: I40fb61a807ca29697aa8025e53967987028efba3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/touch_updater/+/3831326
Tested-by: Henry Barnor <hbarnor@chromium.org>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Henry Barnor <hbarnor@chromium.org>
1 file changed