Drop the downstream patch for systemd
Context
We always try our best to drop all downstream-only patches. We have carried a patch to systemd to satisfy our need. But as systemd is updated, the patch may have to be amended all the way.
Description
I found a way to use SYSTEMD_ESP_PATH to bypass ESP and filesystem root checks, instead of a downstream-only patch.
Acceptance Criteria
Every image is built with the new method.