feat(tpm2-tss): add tpm2.target and systemd-tpm2-generator

systemd/systemd@4e1f0037 added a new `tpm2.target`,
which is now used by `systemd-pcrphase-initrd.service`, and
`systemd-tpm2-generator`, which adds a `Wants=` dependency from `sysinit.target`
to `tpm2.target` when it detects that the firmware discovered a TPM2 device but
the kernel didn't.

modules.d/91tpm2-tss/module-setup.sh

@@ -35,6 +35,8 @@ install() {
  "$sysusers"/tpm2-tss.conf \
  "$tmpfilesdir"/tpm2-tss-fapi.conf \
  "$udevrulesdir"/60-tpm-udev.rules \
+ "$systemdutildir"/system-generators/systemd-tpm2-generator \
+ "$systemdsystemunitdir/tpm2.target" \
  tpm2_pcrread tpm2_pcrextend tpm2_createprimary tpm2_createpolicy \
  tpm2_create tpm2_load tpm2_unseal tpm2