CONFIG_MPC834x_ITX is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Freescale MPC834x ITX

modulename: mpc834x_itx.ko

configname: CONFIG_MPC834x_ITX

83xx Board Type
└─>Freescale MPC834x ITX
In linux kernel since version 2.6.18 (release Date: 2006-09-19)  
This option enables support for the MPC 834x ITX evaluation board.

Be aware that PCI initialization is the bootloader's
responsibility.

source code: