This fixes the problem when the UEFI update depends on a specific BMC
version -- including the backup BMC device means we checking that both
the primary and the backup were above a specific version.
I don't think it's ever useful to show the backup BMC device, so just
don't include it as an enumerated device.
Fixes https://github.com/fwupd/fwupd/issues/4404
This allows the Redfish plugin to "just work" when there is no username
or password in the SMBIOS data. Using KCS we can create an admin account
from the host OS and then automatically enumerate devices.
Only the backup BMC device (which we ignore anyway...) can be updated
by specifying the target ID, the others need an *empty* array so that
XCC can work out what devices need to be processed.
