These units are also present in the initrd, so instead of an assert, just use a condition so they are skipped where they need to be skipped. Fixes https://github.com/systemd/systemd/issues/26358
If we use gpt-auto-generator, automatically measure root fs and /var. Otherwise, add x-systemd.measure option to request this.
Luca Boccassi
Lennart Poettering