Features:
+* Hook up journald's FSS logic with TPM2: seal the verification disk by
+ time-based policy, so that the verification key can remain on host and ve
+ validated via TPM.
+
+* sd-event: port to new kernel API epoll_wait2() (new in 5.11), to get more
+ accurate wait timeouts
+
* sd-boot: define a drop-in dir in the ESP that may contain X.509
certificates. If the firmware is detected to be in setup mode, automatically
enroll them as PK/KEK/db, turn off setup mode and proceed. Optionally,