rauc: rauc-mark-good: disable implicit dependencies

Having implicit dependencies enabled would lead to ordering cycles
when enabling 'boot assessment', through
systemd-boot-check-no-failures [1], which is a service that forces the
multi-user.target to be reached before the boot-complete.target.

The ordering cycle in this case would be:
boot-complete -requires-> systemd-boot-check-no-failures
systemd-boot-check-no-failures -after-> multi-user
rauc-mark-good -after-> boot-complete
boot-complete -after-> multi-user
multi-user -after-> rauc-mark-good

Which systemd would break by simply not running rauc-mark-good.

The solution is to disable implicit dependencies that would otherwise
add an 'After=rauc-mark-good.service' to the multi-user.target via the
[Install] section.

Link: https://www.freedesktop.org/software/systemd/man/latest/systemd-boot-check-no-failures.html
Signed-off-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>

recipes-core/rauc/files/rauc-mark-good.service

@@ -4,6 +4,7 @@ ConditionKernelCommandLine=|bootchooser.active
 ConditionKernelCommandLine=|rauc.slot
 After=boot-complete.target
 Requires=boot-complete.target
+DefaultDependencies=no
 
 [Service]
 Type=oneshot