CONFIG_DT_BCM9EJTAGPRB is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

BCM9EJTAGPRB

configname: CONFIG_DT_BCM9EJTAGPRB

Built-in device tree
└─>BCM9EJTAGPRB
In linux kernel since version 4.1 (release Date: 2015-06-21)