CONFIG_XES_MPC85xx is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

X-ES single-board computer

modulename: xes_mpc85xx.ko

configname: CONFIG_XES_MPC85xx

Linux Kernel Configuration
└─>Machine Type
└─>X-ES single-board computer
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
This option enables support for the various single-board
computers from Extreme Engineering Solutions (X-ES) based on
Freescale MPC85xx processors.
Manufacturer: Extreme Engineering Solutions, Inc.
URL: <http://www.xes-inc.com/>

source code:
arch/powerpc/platforms/85xx/xes_mpc85xx.c