No homescreen when agl-sota is enabled

Update: https://gerrit.automotivelinux.org/gerrit/#/c/16445/ solves the described problem.

Homescreen doesn't work for me (black screen) when agl-sota is enabled. What is known so far:

• Homescreen does work when agl-sota is disabled
• Even without agl-sota after restarting weston

  systemctl restart weston

  HomeScreen goes black and doesn't restart.

• Nothing suspicious can be seen in weston log, weston service is up and running.
• My colleague managed to launch HomeScreen in weston with default shell, so apparently only ivi-shell is affected.
• security manager database is deployed to /var, so it doesn't get to SOTA-enabled image (fixed here, but the fix doesn't solve the main problem unfortunately after proper additions the PR solved the problem).
• /var/local/lib/systemd/system is populated with some services in non-SOTA image, but is empty when agl-sota is enabled. I would appreciate any help here (like who populates this dir, does it leave logs etc).

Has been seen on h3ulcb, m3ulcb and qemux86-64