Add ignition.platform.id=metal for bare metal
Ref:
# If you add something here, also update image-cloud.ks.
+# ignition.platform.id=metal is from https://github.com/coreos/fedora-coreos-tracker/issues/142
# prjquota is for quota enablement for containers: https://bugzilla.redhat.com/show_bug.cgi?id=1658386
# rw and $ignition_firstboot are used by https://github.com/coreos/ignition-dracut/
-bootloader --append="rootflags=defaults,prjquota rw $ignition_firstboot"
+bootloader --append="ignition.platform.id=metal rootflags=defaults,prjquota rw $ignition_firstboot"
