CONFIG_MPC832x_MDS is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Freescale MPC832x MDS

modulename: mpc832x_mds.ko

configname: CONFIG_MPC832x_MDS

83xx Board Type
└─>Freescale MPC832x MDS
In linux kernel since version 2.6.19 (release Date: 2006-11-29)  
This option enables support for the MPC832x MDS evaluation board.

source code:
arch/powerpc/platforms/83xx/mpc832x_mds.c

depends
 or CONFIG_MPC83xx or CONFIG_PPC_83xx