phc2sys: Keep clocks in command-line or ptp4l order. When adding a new clock to the domain, add it to the end of the list to keep them in the same order as specified on the command line or the port order of ptp4l. This will be needed by new code in the domain reconfiguration expecting the order of reinitialized clocks to be the same as in which they were added to the domain. Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>