CONFIG_RTE_CB_NB85E is not available for the selected architecture x86.
Result is shown for architecture v850

RTE-V850E/NB85E-CB

modulename: rte_nb85e_cb.ko

configname: CONFIG_RTE_CB_NB85E

Platform
└─>RTE-V850E/NB85E-CB
In linux kernel since version 2.6.21 (release Date: 2007-04-25)
source code:
arch/v850/kernel/rte_nb85e_cb.c