tresor: revive and test app/tresor_check

The tresor_check tool became outdated back when the Tresor project was created
by re-writing its predecessor, the CBE, in C++. At this time, the check tool
was merely renamed but not updated. As there was also no autopilot test for the
tool, the tool remained outdated.

This commit rewrites the tool for the most recent Tresor version and adds an
autopilot test.

Ref #5062

tool/autopilot.list

@@ -79,6 +79,7 @@ timeout_smp
 timer_accuracy
 tool_chain_auto
 tresor_tester
+tresor_utils
 tz_vmm
 usb_block
 usb_hid_raw