CONFIG_OC_ETM is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

On-chip ETM and ETB

modulename: etm.ko

configname: CONFIG_OC_ETM

Linux Kernel Configuration
└─>Kernel hacking
└─>On-chip ETM and ETB
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
Enables the on-chip embedded trace macrocell and embedded trace
buffer driver that will allow you to collect traces of the
kernel code.

source code:
depends
CONFIG_ARM_AMBA

is depended by
CONFIG_OMAP3_EMU