Remove duplicate definition of add_kernel_table.
Remove duplicate definition of add_kernel_table.

woniullb/babeld,boutier/babeld,tcatm/babeld,sudomesh/babeld,wlanslovenija/babeld,Gwendocg/babeldToS,jech/babeld,wlanslovenija/babeld,Drooids/babeld,jech/babeld,dtaht/babeld-shortrtt-metrics,Gwendocg/babeldToS